I'm in the boat that thinks this would be a stellar move by Nintendo, much better than previous suggestions I've seen that they should pick up THQ, Atlas, or other ailing devs.
As for concerns that they would Nintendo-ize Capcom's output, I imagine that would only be for the best. Capcom has basically crapped out on all of their franchises except for Monster Hunter and Street Fighter. Nintendo might be able to make Monster Hunter have a wider appeal in the West, and I'm sure they'd leave Street Fighter the hell alone, that's a very specific thing with a dedicated userbase who would be forced to buy a Nintendo console to play. And it's not like Nintendo's going to take over development on Resident Evil or something, but they could well crack a whip to get it back into shape. Stuff like Bayonetta 2 and The Devil's Third seem like pretty clear evidence that Nintendo is happy to let other teams go as hard as they want.
I sincerely doubt Nintendo would actually do this, as it would be a Herculean managerial task to wrangle a bunch of new teams with different cultures, but given how important Monster Hunter is to the health of the 3DS in Japan, if someone else looked like they were going to swoop it, it could force Nintendo's hand.