I've always wondered if an xcom style game from the perspective of the federation troops would be cool. Federation Force was very cartoony, which is fine, but the metroid universe is such a gritty horrifying experience for anyone who isnt Samus and I'd love to see a perspective that reflects that. Plus, it would be cool to struggle with your troops through the whole game and then at somepoint have Samus join for a brief sequence and put everything else to shame.