Is the movie Avatar a remake?

I realize i'm much older than most of the people here. I also realize that the taste in theater in America has plumeted to abysmal depths. Which is why The Fast and the Furious, Avatar, and Dumb and Dumber are considered the greatest movies of all time by todays movie goers. However; am i the only one that sees that Avatar and Dances with Wolves are basically the same damn movie? Shouldn't Kevin Costner be pissed? And for that mater TRUE GRIT!!!! John Wayne won an academy award for that movie and somebody has the balls to remake it? What next Casablanca with Ice Cube playing Rick? How about Gone with the wind? (that really scares me because the studios would feel obligated to spend half the movie showing the horrors of slavery, even though that had little to do with the original story, just to show how deeply they share the pains of slavery with the african american community) My question really is, Has Hollywood just run out of gas?