What could persuade me are three things:
1) MORE TIME! I barely got some to try to play at least the best games in my PC backlog
2) Far lower price
3) A larger game library than now to choos from and particularly GT7 already launched
Due to price, I think it will come sooner the time when I'll buy a PSV, also because I could use it when I have spare time for a game, but I'm away from my PC, currently I do some gaming on my smartphone in these situations, but quality is really low, if they weren't F2P I'd never spend money on that crap.