Many people are saying that the PS3 has already made a comeback and althought it is doing significantly better than it was a couple of years ago i don't think that's what the OP was talking about.
I would think that if the PS3 hasn't significantly closed the gap on the 360 by the end of the year or EARLY next year at the latest (as some of the exclusives have been pushed), in the order of 2 million units or at least started consistently outselling the 360 in the order of 50 000 units a week then i think it should be fairly hard for almost anyone to deny that it will never have any kind of meaningful comeback.
I don't consider crawling past the 360's sales after the release of any next generation system a comeback.







