Here's my issue.
From my own personal experience, I know people who bought a PS4 as most active gamers have done. But here's the deal.
I got a PS3 late in the game after being Nintendo-only my whole life, which appears to have been to my benefit as I now possess an excellent collection of games I'm going though. Most recently, I played through the first 3 games of Metal Gear Solid (which has been amazing I must add). I have also played through Borderlands 1 and 2 and Mass Effect 1, Bayonetta, among others. I have shared my experience with fellow friends who now have a PS4 and sold their PS3, but NONE of them played through these games. That's ok, gamers don't play EVERY good game, so I told him some other ones I'm interested in playing, like Red Dead Redemption and Fallout and Demon Souls/Dark Souls. They didn't play through them either.
This is what I don't get. There are arguably some amazing gems of games out there on PS3, and many people who have moved on to PS4 completely skipped out on them. Perhaps it's a good thing there's all these HD remasters releasing so people can play the definitive versions of these games, but even still, it's only a fraction of a series that gets these treatments and there's numerous games that haven't or won't get this HD treatment.
I want gaming to advance. It's got to, but in the meantime, I say enjoy these blessings on PS3/XB360. If you already have, then it's definitely time to move on. If you missed out on tens, even hundreds of great games on those last-gen systems, maybe you should slow down on jumping to new-gen.