thats more of a moral stance than a real impact. some prefer that emus not be programmed/released during the console's lifespan, for obvious reasons (after all, the nostalgia factor plays a significant role in that as well, though the now-generalized backward compatibility in many/most new consoles is eroding the logic of it slightly, as older games now tend to age better than before the 'nextgen' era began)
btw, how ridiculous would it not look to have gba emulators on the DS, just for fun's sake ? ;P