Honestly, even if a company like Nintendo or Sony bought up stock from them, it wouldn't be enough to dictate policy for Capcom unless they got a majority share. I mean Sony owned a bunch of Square-Enix's stick from the merger and it didn't stop Squenix from making or releasing games on other consoles.

In term of who should own Capcom's franchises in case of meltdown. I think Mega Man, Power Stone, and Ghouls and Goblins should go to Nintendo, Street Fighter, Darkstalkers, and Resident Evil should go to Sony, and I'm not sure where to put Breath of Fire. I don't really like Camelot Studios and Monolith Soft is a bad match for the franchise. Sony for me at least doesn't seem to have a strong RPG team like the old days when they were closer to groups like Media Vision. Squenix and Sega both have a really nasty habit of sitting on top of IPs they own. I still haven't quite forgiven Namco Bandai for Xenosaga screw ups and Level 5 tends to be hit or miss with their titles. I guess Nintendo just so it would actually see the light of day. Devil May Cry would go to Platinum Studios but only after they hired Hideaki Itsuno on board.