I might be getting a little bit ahead of myself but for me, the DS isn't simply about new games, but also old games. Now, as much as I love my GBA, it's still not a true SNES to me. First of all it lacks the buttons thus the fighting games don't match up. Second, the sound is worst than the SNES. And third, the resolution isn't even as high as the NES.
Sure there's the SNES and NES emulators for GBA but those aren't perfect. For one thing, the graphics will have to be either squished or not everything will fit on screen. Now with the NDS, I think a TRUE PORTABLE SNES will finally become a reality. It has everything the GBA lacked and then some. And really, why stop with just SNES? I'm sure the DS can emulate pretty much every 2D system ever created. Nes, Snes, Genesis, Turbo Graphics, GameGear, Neo Geo, WonderSwan Color, Neo Geo Pocket, Gb and GBC. Can you image being able to have so many systems with you, and they're all portable!?