I wouldn't. I've still not played through all the first party games I have for the Wii U, and I'm still missing a few big ones like Pikmin, DK, Wonderful 101 and Captain Toad. I still also don't have a PS4 yet, but my next gen 3rd party games'll be on that, and I can't really trust Nintendo to have an equal 3rd party support anymore, especially since games that are being ported to last gen, and hell even the Wii, aren't releasing on Wii U.
So no, I wouldn't get one until either a price drop, a new Smash Bros, or anything Galaxy related that takes advantage of a stronger hardware. As in a Pokemon Gold-Heart Gold level improvement, not just a HD port.