Revan Baratheon, on 23 January 2012 - 10:05 PM, said:
More believable than Jon..atleast he has the targ look
Just because Jon does not look Targaryen, doesn't mean he isn't the son of Rhaegar and Lyanna.
I am referring to this quote,
The hedge knight
Page # 23
He does not look a Targaryen in truth, with that dark hair. Dunk said as much to Egg.
“It’s said he favors his mother,” the boy reminded him. “She was a Dornish princess
So Jon could easily favor Lyanna's 'Stark look", over Rhaegar's "Targaryen look". From the quote above it is very clear that the "Targaryen look", is not always dominant.
I am really getting tired of people using that argument, as "proof" against R+L=J. I believe GRRM put that information in The Hedge Knight for a reason.
And as for GRRM changing his work, because fans figured out the "secret"
Here is a link to an hour long video, of an interview with GRRM.
In this interview he specifically said, that he would not change something just because fans figured it out. And he explains how it would be worse for the story if he changes "the big secret", to something random, because there would be no foreshadowing to hint towards the "changed secret". And he said if you change it, then you make all the previous foreshadowing mean nothing. So thats why he thinks it best to just stay away from fan forums. (this all pretty much in my own words, and it's explained much better in the video, so I suggest to watch it for yourselves, if you haven't already seen it)
In short GRRM won't change the story, just because fans figured it out.