Well, the one thing that would really make me never come back to GT is if they implemented a feature where the PS cam would check if I was naked and if I wasn't I couldn't play the game, however if I was it would record me playing the game and send that video to all my Facebook friends and then after it did that it would make loud random noises for an hour and then the screen would turn black for 71 seconds, after that it would turn into a pokemon like game for 3 minutes and 24 seconds and then it would get back to driving, but the controls would be in reverse and it would be all like "hahahahaha, look at you driving naked with the controls reversed!" in the voice of Vettel.
That is really the ONE thing that they could add that no matter what else was added, I'd never come back to GT6