Why would Luigis Mansion need a sequel?? It's like asking for a sequel to E.T. or The Wizard of Oz. The story is done and should be left alone before it's ruined. Didn't you see what happened to Aladdin and The Lion King?? Classics and imagination destroyed by their sequels.
I honestly think you kids at Wii Chat are a little closed minded. Nintendo should make a completely original game starring Luigi. Or better yet, Nintendo should make a completely new platformer with new characters . Yes I said it, NEW CHARACTERS.