The problem with buying a company like Capcom, is you buy the name and the IP, but you may not be able to retain the talent.
So Nintendo would rather court the talent, possibly with offers such as helping them fund their own studio w/ a development contract. But regardless, Capcom would be a good buy even if they lost a majority of the talent.
If they could hold onto the SF Team, the MH Team and re-organize a new Mega-man team, they are already winning. VC would get a HUGE boost and Smash Bros. now has room for a major expansion.