Would also ask, if you didn't have a Wii U, would you buy one now and work through the back catalogue knowing what has already come out for it? It's certainly a console I'd have picked up later down the line if I didn't get one at launch. General rule of thumb I use for buying a console though is making sure it has enough games to make it worthwhile before buying.
I still get a fair few consoles at launch because usually, there is enough in the first year lineup to interest me.
Yeah Wii U has been a trickle, but when the big hitters do come, pretty much every single one of them would make me go "dammit I wish I didn't sell my Wii U!" had I ever sold it.
I foolishly bought my Wii U in November of 2013, on the naive assumption that once Nintendo got to grips with HD development, a smoother schedule of releases would ensue. Instead, the game droughts and delays continued year after year.