It's just the next era of gaming. I know it's hard for the PS generation to understand but there was actually generations before 1995. In fact, there's been shifts like motion control before such as bringing 3d into games and actually having a screen move (as opposed to nothing but static screens you move to and from).
The 3d era had a TON of really horrible, crappy games. In fact if you look at any major tech jump you're going to see the same thing to a greater or lesser extent. The only difference is this time around the tech is being met with resistance from crying manbabies who would rather make the same played out shit they have for the last 15 years (only this time in HD!!!) than try something genuinely new.
You really think after the success of the Wii that motion control won't become the new standard for all future generations? Yes, there will be more elegant solutions to motion gaming than wagglewaggle, and we'll probably see some interesting and significant jumps in technology, but it's a testament to how uncreative the video game industry is as a whole that we haven't seen new genres pop up.
The industry outside of Nintendo is dying and catering to a smaller and smaller group, I sincerely doubt Sony and Microsoft are going to release another console where the standard control isn't some kind of motion controller.
That era is dead and ironically the 2 most powerful consoles on the market are dinosaurs playing catchup to the weaker console, but evolution has never been about who is strongest and rather who adapts to change the best.