I don't think Metroid needs a multiplayer mode. Can't imagine a series that is most identified with single player story heavy gameplay would somehow stumble upon some multiplayer formula that would blow people's minds and propel it's sales up much further than it would have if they only focused on single player and really made it amazing.
That said, as someone who actually loved the hell out of Hunters and enjoyed Federation Force, I would take some spin off game like that on the eshop in a second.
That said, as someone who actually loved the hell out of Hunters and enjoyed Federation Force, I would take some spin off game like that on the eshop in a second.