Considering how small WiiU's installed base is and how much smaller the base for such games is, - which is not likely to grow significantly by this holiday season without any non-Nintendo exclusives - buying exclusively for WiiU in hopes of maintain 3rd party favour seems like folly. Unless Nintendo does some genius marketing campaign, or Sony and MS suddenly going bankrupt, there's little hope any core 3rd party titles will sell impressively on WiiU.
Buy it for WiiU if you think it'll play best on WiiU and you really want it. I bought plenty of 3rd party games for Wii and it didn't actually help anything, but at least I put my money where my mouth was. However, I still only bought the games I actually wanted to play on the system I wanted to play them on.







