First off no first party publisher should be interested, most of Capcom's value right now would be lost if that happened. a lot of their investment is in mobile and PC online and social games recently and they also have franchise deals tied up with all three first party publishers which they would likely have to pay to get out of. Which including the fact they would have to over pay above market value of the stock to buy out more than 50% it makes it a really bad investment for any of the big three. Third Capcom aren't struggling financially they gave actually turned a profit every year since 2005 and was up YoY as of their last financial report.
Now onto who would actually be in a position to buy them. The most likely candidate would be Tencent who are flush with cash and have been aggressively investing in games companies including Epic Games and a 6% stake in Activision Blizzard. They are already working together with Capcom on Monster Hunter Online which is developed in partnership for the Chinese market, and also to bring other Capcom games to China.
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