Kind of hard for Nintendo to stick with the Wii U when it's been selling very bad this gen. It's Nintendo's worst selling system since the Virtual Boy.
Besides, it's been known for a while that Nintendo is going to releasing the NX soon.
So Nintendo is fine with treating Wii U owners like second class citizens just for more sales? Well that excuses them of course, if it's for money.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.