We seemingly say this every year, but that is NOT a typo.
http://www.nintendoworldreport.com/news/50764/just-dance-2020-announced-for-switch-and-wii
Just Dance 2020 is going to make history.
Ubisoft's annual dancing game will launch in November 2019, and will come out on Switch and Wii. Unlike prior years, a Wii U version will not be available, but the Wii version can be played on it.
With Just Dance's release, the Wii has now had game releases in 14 years, making it the longest supported Nintendo console in history and tying the original Game Boy as the longest supported system overall.
I legit wonder how many people are buying Just Dance on Wii at this point thinking it is going to be a rare 'last title'. Then it's not, so they have to buy the next one.
Meanwhile, it's cheap to make and UBISoft is seeing all these sales and is like "Well, they want it..."
It's mostly hospitals and retirement homes that keep this franchise alive on the long dead Wii...