I guess my problem is more cupboard space than money.
I aslo believe that they are going to port it, as they already said that they had the engine up and running. So Sony would be crazy not to improve the release roster by also including this game.
Well, I suppose its possible. Porting isn't always quick-n-easy, but Sony may decide its worth the effort. I'm not sure they'd waste Naughty Dog themselves on the porting effort though, unless its already well underway. They're going to want to use them to get a PS4 game up and running as soon as possible.