I think Capcom is too big, but buying 50% of their stock for around $500 million (not sure if the numbers I found are correct) would be a steal.
They have some of the most well-known franchises and many of them like Mega Man, Resident Evil, Street Fighter, Monster Hunter, Breath of Fire or Viewtiful Joe have a Nintendo history.
But most of the key developers have left Capcom due to their new direction in the 7th gen. Nintendo would have to try to get some of them back.