HD collections haven't really been that popular, and are only prevalent because Sony screwed the pooch on BC.
That and the prior generation of hardware was still saddled with crappy standards for output and resolution. The classic games don't die, but they can be miserable to play on modern televisions.
Though on the arguments about rehashed games destroying the audience for new releases, it's an age old saw that I don't think necessarily has anything to do with hardware generations. Using new hardware to revitalize interest is something of a crutch in place of the ability to make quality, timeless games.
Only the hardest core gamers this gen notice the shaders in the PS360 are 'old' now. Or even notice the difference between 720p and 1080p. Gamers in the middle just want good games. The problem is that audience apathy can, once established, punish what good games do get released. Because the average person has now lost interest, assuming that "games are boring these days", and they stop looking for new stuff. Only the few remaining tentpoles garner much attention, because the average gamer has trust in those brands having delivered a major experience before.
The real problem, moving into the future, is that the industry is going to have to mature beyond pumping out a thousand copies of the last breakout hit. Because eventually shiny new consoles aren't going to provide shocking leaps in immediate audio-visual impact in order to reignite interest among the public. It's all going to be about content, and the industry is still dominated by toaster men who believe they're selling bars of soap and boxes of crackers.