I dont quite understand your point really... ... snes has more memory - and can do alreet 3d with the super fx chip... I've not seen any games come close to the PSX in 3D ability... or I've not seen any 3d on the GBA!
with the colours though- its like comparing Speedball 2 to Speedball 2 AGA... most games dont even need that many colours onscreen at once... especially not any gba game on that small screen - saying that its more powerful is correct in someways, but its like heat... so much wasted for no noticeable improvement.
AFAIK most, if not all snes games run in 512x resolution
If it wanted to be superior to the snes, the games needed to be BETTER than the snes - thats where it counts... and IMO it doesnt have a chance as most things on the snes were revolutionary... same thing went for the Amiga, and the Megadrive... the only thing the gba did was get 2nd class snes games to fit into your pocket.
- ps: No other mario kart comes CLOSE to the SNES version! - word