Sure. Like I said, I'd only be OK with it if it worked story-wise. And, like I said, it wouldn't even have to be Tennant, necessarily, or even in the show Jessica Jones. I could see a whole Agents of Shield episode about his body being stolen by HYDRA (or IFC). Hell, Agent Carter already had a character a whole lot like Killgrave on its show. This. Pretty much. It occurs to me it would be pretty fascinating to have Jessica Jones or Luke Cage encounter a kid with Killgrave's power down the line. Not for a few seasons, but later? Could be pretty interesting.
I don't believe this is true at all. The season is strong enough to stand on its own, whether Kilgrave is ever brought back in some fashion or not. It's about recovering from abuse and choosing to become a hero. And in real life, people do that whether or not their abusers live or die. People, both victims and abusers, sometimes move on. I'm not saying that he even should be brought back, necessarily, but that if they found a storyline that made sense to include him or one good enough that he, or his power/offspring, could still be utilized in some fashion, I'd be fine with it. Basically I think, from a storytelling perspective, especially one that's serial in nature, that it's always a good idea to keep one's options open. That said, if at the end of the next season of JJ we found a taunting video from Kilgrave a la Moriarty from the latest season of Sherlock, that'd be a big mistake and a sign they're out of ideas. I actually didn't mind them bringing Coulson back--and thought the TAHITI reveal was fun. Not the most compelling TV, but enjoyable. I also don't think Coulson's reappearance would need some sort of huge exposition four movies later. Basically a one-off line from one of the characters would handle it adequately, IMO.
For this season and Jessica Jones, sure. Having her kill him was an appropriate ending. But it's comics; no one ever stays dead (see Agents of Shield). And let's not forget he started out as a Daredevil villain. In fact, Daredevil was the only one capable of resisting him in the comic at first, something about DD's powers giving him enough resistance in typical comic, hand-wavey fashion,. Looking it up, it also looks like Doctor Doom and Wilson Fisk have also resisted Kilgrave completely unaided. Both in fact forced Kilgrave to aid him in some plot. It would have been interesting to see D'Onfrio and Tennant share a scene. I could see him or his power coming back in some fashion, perhaps having the virus in his body weaponized/synthesized as some sort of plot line. One his recent comic storylines had all of his bastard children coming together to form like a Purple Clan, which was very creepy. I don't think it'd be good for the Jessica Jones series, but could see it being used in Defenders or as a subplot/guest appearance for Agents of Shield. I gotta believe that HYDRA would be dying to get their hands on Kilgrave's body...
I've read several folks saying that it's too bad they had to kill Kilgrave off, even though it was thematically appropriate for the season. The thing is... they totally have an out to bring him back. The Purple Man's been killed before, but no one ever really dies in comics. The chemicals that gave him his powers also gave him a sort of lower-grade Wolverine-like healing factor, IIRC. So if they wanted to bring him back, it's totally possible. Granted, I don't think it's something they should do--at least not for a few seasons, or maybe a different show, perhaps in a Masters of Evil type group, only in incapacitated fashion a la the Jason Stryker from X-Men 2 or something.
This was exactly my assumption as well. Whether due combination of her powers and the long exposure, or just long exposure itself, she began to develop an immunity and killing Reva was the catalyst that snapped the already fraying control. So it was a combination of exposure, wisdom save +2 after having been made into a murderer, and perhaps powers. I did notice that Luke Cage hesitated while fighting her and even told her to "do what she had to" at the end, which shows that he was already gaining a resistance (and this with Kilgrave's magnified powers) as well. I wonder if the vaccine wasn't at least somewhat effective, as it seemed like Kilgrave's father initially resisted his command. There was a look of joy on his face, but then he gave in.
I was thinking it over today, and for me, my favorite moment in the series, when I actually stood up and cheered, is when David Tennant shouts "Let go of me, Jessica!" and... nothing happens. From the earlier flashbacks, where Jessica wandered from him after killing Luke's wife, I had suspected she might prove resistant to his powers, but that moment proved it, and the terror and frustration on Kilgrave's face sold it. It was a beautiful payoff. Still, I wasn't completely sure until they confirmed via replay in the next episode. And Krysten Ritter's small smile, despite all of the horrible shit that had just gone down, realizing she'd never be overpowered by that creep again, was just absolutely perfect.
Thematically similar does not mean they were necessary or appropriate for the story. They could have cut both characters and their storyline completely and had a much better, tighter show--with everything happening the exact same way. Seriously, they really should have been left on the cutting room floor. They reminded me of the neighbors in the godawful Punisher movie. Whenever they had a scene, especially the lunatic girl twin, I thought to myself "Why am I watching this? Let's get back to the actual story."
I have to admit that I stood up and cheered when Killgrave screamed "Let go Jessica!" and she didn't. I really wasn't sure if she was under his control at the finale. At first I thought she might be faking it, but then Kristyn Ritter did such a creepy smile that I thought she actually had succumbed. And that's why I loved that she hadn't. Tennant's character was just charming to seem almost human at some points, which made him all the more disgusting and terrifying as a villain. The flawed portrayal of Jones really worked for me. Honestly, you cut out the weird-as-shit-totally-unnecessary-incesto-twin-neighbors, and the show would have been almost flawless. Simpson's stuff was a bit out there too, but I wonder if they were trying to set that up for Daredevil or another show.