Ok, I stand corrected. They could put SMAS on the GBA, but it would still be a dumb idea.
GBA is not capable of supporting full 3-D graphics. Leave the N64 Game ports to the DS.
Super Mario Advance 5 has not been announced.
Yoshi's Story for GBA is no longer listed as an upcoming game from Nintendo.
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"Legolas is a guy?!" -My Sister