Nintendo should take the Other M engine, beef it up for the Wii U in 720p, and make a new game out of it centering around a different bounty hunter in the Metroid universe.
Just make it a straight up bad ass action sci-fi game. And get someone decent to handle the story stuff.
But attaching the Metroid legacy gave that game too much to live up to. As an action sci-fi game taken on its own merits and ignoring the cheesy writing of the plot, the game wasn't that bad honestly.