No surprise here.
We saw this happen with Tony Hawk, and now it's happening with music games. The real question now is... what's next? Music games will still have a following, but for the most part a lot of people have had their fill, and are ready to move on to something else.
Personally, I expect the dancing game genre to take off even more than it already has, it just has to sway those who think about dancing and go "I can't dance for shit".
Currently playing: Uncharted: Drake's Fortune, NBA2k11, Metal Gear Solid, Picross 3d