People are ignoring the redundancy factor. The Wii U cannot compete with the PS3/360 for PS3/360 ports. It's not simply the idea that the Wii U will have drastically lower sales of those ports, it's the idea that you would have sold that game to that Wii U owner anyway, considering the high odds that they already own a PS3/360. In those cases, the developer is basically paying extra overhead without reason. How many Wii U owner who are interested in the next Battlefield, for instance, won't have another console to play it on? That's a very real consideration for publishers.
Really, in the present situation, outside of platformers, which might appeal to the Nintendo-only crowd, there isn't much money to be made with the Wii U. For the short-term, it probably isn't worth investing in with most genres.
Only in the long-term would it have a shot at paying off, if you think that the Wii U will ever have enough unique gamers who only own the Wii U. Even then, with PS3/360 ports, it really won't be worth the cost. It's only when we reach next-gen-only software that the Wii U's installed base might have some significance.
So the two philosophies regarding the Wii are probably 1) sit back and watch it sink or swim, then jump aboard if things begin to look favorable, or 2) attempt to help develop the Wii U's installed base with the hope that you can break even or make a small profit now and make a much more substantial profit in the future. Honestly, they're probably both valid.
