Super Smash Bros. (but, I am sure we'll get that. SSBM was the GC's best selling game.)
Super Mario ------ (I want a new, original 2D Mario!)
Star Fox (Don't hand it to Namco this time...)
Mother 2 (I want it over here!)
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Also, I don't think Nintendo could port Super Mario RPG, since Squaresoft helped out with that one. I'm sure they would need a license to do that, and Square may (I may be wrong) own some characters (Mallow, Geno, etc.) I think that's the only reason they haven't already brought it back...