no! why? because there are emulators for GP32 around.
GBA has:
NES (PocketNES by FluBBa)
GB (Goomba by FluBBa, no GBC emulation, the fact that it can run original GBC games isn´t considered emualtion)
SMS/GG (DrSMS by Reesy, author of DrZ80 which is going to be used in fGEN)
PCE (PCEAdvance, again, by FluBBa)
ZXSpectrum (ZXAdvance by TheHive)
SNES (SNESAdvance by Loopy, Alpha stage, not very playble)
COllECO (COQ by TheHive)
and others, that are emulated equaly/better/not as good on the GP.
I schould add, that all emus for GBA are great, but I dont like the fact that you can´t see the full game-screen, without resizing it to the bad screen of the GBA