Power is an issue, but I think quality of games is just as important. If one console fans bitch about the quality of their game compared to another console, then the PS4/XB720 for me is a pointless endeavour until they can pull the thumb out of their asses and create a quality game, not shitty ports.
They create ports from PC because they can't make a game of such a high quality on our consoles anymore, and the great games of the last year or two are as good as it will get with this tech. And anyone comparing PS3 to 360 tech is stupid, they're both ancient to the point that debating between the two really is just... well, as I said, stupid.