Sega is pointless, their value has long since passed.
Nintendo though from Apple's POV wouldn't be a bad get. Exclusive Nintendo games on their iPhones, iPads, Macs, the ability to turn AppleTV into a full fledged console, etc. etc.
The problem with that is Nintendo would not willingly want to sell and they are positioned well against hostile takeover bids because they own a large chunk of their own stock.