No, What I think they should do is utilize that game boy slot on the DS and make more game boy advance games for the DS. They could even make games that utilize both the DS and GBA slots. We already know that the DS games can recognize certain games, so why not?
yeah! with the next DS they should make the gameboy slot play all type of gameboy games not just advance. and they should give devs the option of making better gba games...like "super" GBA. so your ds will play all gameboy games new ds games and the new "super GBA" games
Nintendo can say all they want, the DS should have been the GBA's successor and it is with the problem being that it can't play GBC or GB games. I know there is a separate system that is supposed to be the GBA's successor so maybe the DS was just a test for something new getting people to totally think different rather than "another gameboy". I can't see them throwing out the touchscreen for any handheld in the future unless the the next big thing is actually better.
what would be kinda cool: nintendo could release official roms for gameboy-games, that you can purchase through the shopping channel.
then you put them on a sd-card, and put it in your "DS 2" and can play them.
with wiiware, people could even make oldskool gameboy-games that could be played on the ds 2.