I agree with others that there are certain 3rd party games that can succeed on the Wii U but I don't think we can really specify what kind of game that is. I woulda thought Wonderful 101 would have sold more then 250k by now but nope.
Developers are gonna make games specific to the Wii U, not unless Nintendo is funding them, so it really is a dead system for most games 3rd parties.