i say yes!
i think sales of the games they think hardcore gamers would like does play a factor.
ds has so many sales and now gta is available for it.
if wii keeps sales up rockstar might b forced to make gta for wii as well.
remember that systems or games arent hardcore only gamers are.
also keep in mind that companies think in terms of what they think they could sell a lot of. if any 3rd party thought a game would sell they would make it and sell it.