Oh gawd I hope they don't make this. Wario is totally lame.
Okay, let me make this as clear as possible. You are wrong. There, let's hope that makes sense, I believe you'll find that simply because he isn't your favourite character that doesn't mean that everyone hates him.
There have been quite a few Warioland games, Wario World, Warioware games, and Wario Master of Disguise, all have been relatively successful games.
However, I would rather a new Wario World, I believe it would really benefit the 3D graphics and be much more suited to the 3DS, also, Wario Land Shake It, came out not that long ago.