Doesn't Resident Evil 6 suck? I've heard that, like a lot of bad games, it has sold below expectations so I can see why Capcom would want to try to get some Wii U sales to compensate. But I'm pretty sure the game has sold below expectations because it sucks and negative word-of-mouth has killed it. So I fear that Capcom will make a Wii U version, it won't sell because it's a crap game and it will not have the benefit of early adopters buying it before the negitive opinions were in, and then Capcom will base future Wii U support on that. Much like Mass Effect 3, it's a con game that only Wii U owners that are completely ignorant of the rest of industry would buy. Capcom's hope would be to get enough people thinking "hey, Resident Evil!" without knowing the full details.
So either the game sells and third parties figure that Wii U owners are dumb rubes that will buy anything OR the game flops and third parties figure that Wii U owners don't support third party games. It's a rigged game.