Maknig a game that has Avatar level of graphics will take a lot of time. It's not only about the technology, but also and mainly about hell of the amount of time to spend on the project and work. And of course money. Zalbard is right here it would take a decade to create a game that would look like Avatar at least. If it were otherwise we would be having Avatars every two months in pc games and in the movies too )) And it would definitely be making them money, if a project like that wouldn't have required that much of efforts and time thus bearing a load of risks to never pay off...Right?
It looks like you guys are saying the same thing but don't understand each other for some reason.