I really liked the idea of the application, now you can play with everybody, everywhere and just with a smartphone, and if I'm correct, you can purchase any song you want.

So, yes, I'd say the business in consoles should finish.

the dev costs won't be much, but the licenses for all the music tracks might very well be high.
We've already seen the effects. There's far less advertisement for the past games.

I imagine those games are super cheap to develop. What costs them money is the licensed music (which is why they usually mainly use old songs and a few new ones) and the PR.

If the franchise doesn't sell millions anymore (tracking might be off) they can just scale back on PR and still sell a good 500k or so copies across all versions and probably make a decent amount of money with that.

It was wise for them to make a mobile version considering the series decline of consoles.

I hate this games but they work and they are very fun for some people, i think is still having very good sales, specially on Nintendo consoles so they can still make another one next year, why not.

How can you say that without Just Dance Taylor Swift edition being announced yet?

1.5m copies sold on a game that probably costs pittence to make? No way.

Confirmed!
Nintendo gamers have more girlfriends!

according to the OP 1.1M and over half on wii.   the franchise is dead or at least most of the way there.

game development may cost a pittence but i assure you that the music industry's licensing fees are not.