The small fortune you spend on the peripherals did annoy me on the Wii. I'd be alright with a Wii U, though, as I still have my wii somewhere, together with all the wiimotes and nunchucks, and I'm sure they're compatible. (Though I'm not sure if you need wiimote plus. I think I have 3 standard wiimotes, one adaptor, and one integrated wiimote-plus, but I'm not sure - it's been a few years...)
The games are mainly cheap. If I had the console (and assuming I'd got Mario Kart and Wind Waker bundled) I'd be satisfied without buying any other games for a while - and I'd happily pay a tenner each for Wonderful 101, Super Mario World, ZombiU, Lego City, and possibly one or two others.
Not much in the pipeline, but that's fine - as a second console I'd be happy buying a game once every two months or so - so buying the above plus X and Super Smash Brothers should see me through this year, and they'll likely get a Zelda game and a few interesting bits and pieces here and there that I don't know about in 2015.
Don't get me wrong - I'm not going to buy one. No way I could afford to any time soon. But I'm saying I can definitely see an appeal now that I couldn't last year.