When I think about it, Nintendo probably could get remakes of Gold/Silver out in time for launch with a bunch of DS specific features if they reused some art assets...
I'm by no means a Pokemon fan, but a remake of this with nice, clean graphics, wifi trading+multiplay (hopefully using a builtin Pictochat "Buddy List" online play feature), a touchscreen Pokedex, and voice recognition "training" would probably get me to buy it without even thinking twice about it.
Plus there would be damned riots in Japan to buy the unit if they did that.