You think at the moment. Games are being released with multiplatform in mind. So devs are making sure the game is feasible on last gen consoles too.
When they start concentrating on current gen only. That's when we'll start seeing what these consoles are made of.
Look at the current gen only games, they're looking great.
These consoles will last probably just as long as their older consoles.
We didn't really have that problem last gen at launch because of the jump to HD and the introduction of a proper online platform.
I still think that they should have released the consoles this holiday instead of last year.