Ramsay wouldn't see it as turning on the crown, he'd see it as taking justice on Jaime for stealing his playthings. He probably wouldn't consult with Roose on it, either. Look at what he did to Reek: he mutilated a potentially valuable prisoner, without his father's knowledge (on the show).
I'm hoping that Brienne and Pod will try to rescue Sansa Mance Rayder-style. Sansa and Theon escape Winterfell, but Brienne is captured. Once Ramsay finds out that Jaime was the one who sent Brienne, he'll threaten to kill Pod if she doesn't write a letter to Jaime saying she's found Sansa but needs his help.