Just Dance 4 on the Wii is going to outsell all other versions even though the Wii is dying and will supposedly get passed up by the HD twins in certain territories

[Barozi]

We'll see how it's doing this holiday, but I expect a lot worse than the previous 2 games.

Wii version:
Just Dance 2 - 238k + 203k + 236k = 677k after 3 weeks
Just Dance 3 - 138k + 173k + 200k = 511k after 3 weeks
Just Dance 4 - 60k + 149k + 136k = 345k after 3 weeks

JD3 actually outsold JD2 in the same holiday timeframe despite having a much worse launch.
The lead was as high as 2.24m units after week 14, but JD3 proved to have far worse legs and its current lead is only 1.15m after 55 weeks (and further sinking).

http://www.vgchartz.com/tools/game_comparison.php?reg=Global&ending=Cumulative&game[]=Just+Dance+2+%28Wii%29+[45671]&game[]=Just+Dance+3+%28Wii%29+[48264]&game[]=Just+Dance+4+%28Wii%29+[70917]&game[]=Just+Dance+%28Wii%29+[40053]

Decreasing Wii sales won't help the series and people won't buy a WiiU to play Just Dance 4. If you do, there is a good chance you're simply taking a sale away from the Wii version, since you seem to be a fan of the series.

Overall I expect the Wii+WiiU version of Just Dance 4 to be selling worse than Just Dance 1. With JD4 on Kinect it might have a decent chance to sell more than the first.