When Ubisoft stops making Just Dance.

Just dance will get a 2016 version and maybe even 2017 too. Apart from that dunno what else.

When Just Dance starts to sell under a million, then that'll be the last. Probably around ~2017

We have just dance 2015 sitting at 1.65 million right now, it'll probably break 2 million lifetime and still outsell every version ever released on any other system other than wii. I see no reason why it won't get another and still probably break a million, then it might even get another after that.

When EA and Ubisoft truly stops supporting Nintendo..

Skylander was trying to make their Wii audience jump U last year, giving them the U digital game free with the Wii version; maybe that's the last of that. And Just Dance Wii fans are still happy with what they offer.

But yes, last one so far it's Rodea

http://en.wikipedia.org/wiki/List_of_last_games_released_on_video_game_consoles#Worldwide

This decade, I'm 100% sure of that!

Back in the days (C64) the joystick simulated the hand movement: https://www.youtube.com/watch?v=oMjrURyknOA

Should work well with the wiimote.  ;)

Ports will release on Wii until end of 2015.

10 years in the making.