I'm surprised rockstar hasn't brought out remakes or remasters of the GTA3 trilogy out for current systems. Keep the city layouts and gameplay the same but upgrade everything graphic related (textures, lighting, character models etc...). Perhaps the only gameplay tweak for gta3 and Vice City would be to update the controls to match San Andreas (like being able to control the camera with the right stick). I mean they don't even have do this internally, they could outsource it to a reputable developer who is experienced with this sort of thing (like Bluepoint Games). Seems like it would be easy money.