Yeah, the Wii U is a lost cause as I said. I knew that before buying one, but decided there were enough games out and announced that I'd get my money's worth. At a bare minimum there's NSMBU, NSLU, Mario 3D World, Rayman Legends (best version), W101, Mario Kart, Smash Bros., and a Zelda in the works.
And as they can't pull the plug too soon--or else they'll piss off everyone who bought one and canabalize a bunch of potential sales of their next platform by alienating their hard core fans--I'm sure there will be at least a handful more solid first party games. So I don't think they'll abandon it. They've got little choice but to ride it out for at least a couple more years, unless they do say

it and go third party or portable only and give up on home consoles. Which I don't see happening. I think they put out at least one more home console (or a hybrid portable). If that bombs, then yeah, they're done at that point.
They should really pump out some more HD remakes. Apparently Wind Waker HD only took them six months or so. If that's true they should get an HD collection of 3D mario games out, Metroid Prime Trilogy in HD etc. That wouldn't cost much, would sell well to the existing base and probably help entice some more fence sitters.