Well, some people will be sad, namely Sony and MS fans. As I said for a longer time, if Nintendo is going 3rd-party, they will do on mobile not on console of other companies.
Anyways, so far it doesn't seem bad. It looks like the deal means Dena-games can use Nintendo-property, not Nintendo-games on mobile. That wouldn't make too much sense anyway, at least not with usual controls.
And Dena will bring Tomodachi Universe, with in-app-purchases for clothing, songs and room-decorations and they will explode with money.