The Gameboy Advance also died in 2007, if I'm right, making it 2 years after the DS's launched.
I think the DS would live longer, because Nintendo only released 1 or 2 GBA games after the DS's launch, while the DS already got Pokémon Typing DS, Zelda Four Swords Adventure (DSiWare), Kirby Mass Attack, and a few more I'm missing, and these games were released after 3DS's launch.
I think the DS games will last longer than the GBA games. If they make a third Pokemon game for Generation V, it'll have to be on DS. The same would go for any remakes of Ruby or Sapphire. They have to be on DS so you can trade Pokemon. These games are probably not going to come for a couple of years, so the DS will have to stay until then.
>>Mighty the Armadillo
Not in Europe (March 2005), and since I live in Europe and got the European version, I'm looking at that launch date.
Actually, my first non-European console is Nintendo 3DS, so I look at both of their dates.