You can use the "Gamecube Game Boy Player" to link with another GBA so that's pretty cool.
Where I live old SNES games are impossible to come by. I do actually have a SNES but the only game I have been able to get my hands on is Mega Man X. Still looking for Mega Man X2, Mega Man 7, Metroid, Zelda and a few other classics. And I would very much like to get my hands on a SEGA CDX and copies of Shining Force I, II and CD.
Luckily I was able to purchase a copy of Chrono Trigger, Final Fantasy IV, V and VI on the PSX, thank god they where ported. I'm sure that there are places that sell used copies of SNES games but there are non that I know of here in Denmark. So the closest I can come here is looking in the selling section of the paper or search E-bay. E-bay is out of the question since 99% of the games are from the US and won't work with mine SNES. Living on a limiting budget I don't want to pay the sky high prices of E-bay in order to get a US SNES and games plus shipping.
Besides as I said before the GBA doesnt get old games we actually get new games, and what more we get new GOOD games. The SNES is great and all but its a dead platform but the GBA is very much alive and rocking. My only concern about playing GBA games on the big screen is that what might look good on a 2.9 screen might not do so on a 29 screen. I dont remember what the standard resolution on SNES games where and how it compares to the resolution on the GBA, but a comparison might give a pretty good impression of how it will look.