I had a wonderful 4 years of playing a Wii U and it’s a great machine. But given that the Switch has years ahead of it, it’s pretty hard to justify buying it even fairly cheaply over a Switch.
I agree it’ll hold its resale value though and be a collector’s item. It’s great for playing Wii games on too.
If you do end up getting it, and WWHD on it is great, especially with the second screen, holler and I can also recommend a bunch of great games for it. But you should go into it knowing that many of the consoles best games are now on Switch and the handful that remain could still be ported (WWHD/ Twilight Princess, SM3DWorld)
I think there’s only a few unlikely ones due to the controls: Pikmin 3, Wonderful 101, Wii Sports Club, Affordable Space Adventures, ZombiU, Nintendoland. I also am not entirely sure how Metroid Prime Trilogy would work without Motion Controls.