I find the reaction to this new partly hilarious and partly disturbing, i would love to see what would happen if KH3 or something is also an WiiU-exclusive

hm..
other franchises that might take a plattform jump to Wii U in my opinion are:

Valkyria Chronicles, Sakura Wars, Yakuza, Dragon's Dogma, (new) Prince of Persia, The Darkness, several of the Musou titles, Pure/Disney interactive racers, Tales of, Vocaloid/Hatsune Miku, Stuntman, Dragon Age and Mirror's Edge

If they want to ride the butthurts, they better do it fast before people got it figured out and not fall for it.
I predict it will work 3 more times.

Okami please.

I think plenty of people were already pissed off that VC2 and 3 were PSP titles and not on PS3.

I can't picture Yakuza going to another system, considering they have only been on Sony's systems (5 main games and a few side story games).

There's already a Musou title for Wii U, Warriors Orochi 3 is being ported over.

I can see a Tales of game being made for it.

Mario games sell well because he is an iconic character and has been around since the 1980s, while Bayonetta has only been in one game (two if you count her appearance in Anarchy Reigns). While exposure is important, sales are still important, as they need to cover the development costs somewhat.