[untog]

That's all true for now. But eventually you'll be able to throw some actors in front of a green screen and do everything--makeup, wardrobe, special effects in post production, with one guy.

There was an interesting interview with Ewan McGregor, where he described working on the Star Wars prequels as a total nightmare. He was in front of a green screen, sat on top of some wooden box (it was supposed to be an animal we was riding). As the box swayed from side to side, George Lucas yelled "Look at the moons!".

To which McGregor said "WHAT MOONS?". As an actor, he was so distanced from the scene that he was unable to perform to the best of his abilities. The output speaks for itself.

TL;DR: focusing solely on technology without thinking of the human factor is a bad idea.