Digital effects will replace actors someday. Its only a question of when. Really its a matter of cost. Its now to expensive to create digital actors for every movie. Digital effects are getting better and cheaper every day. When Jurassic Park came out in 1993 I had no clue how those effects were created. My 5 year old mind was absolutly amazed. I have loved digital effects from that point on. The digital dinosaurs in the movie looked so lifelike. And that was 11 years ago. 7 years later we got Walking with Dinosaurs. One of the most amazing and epic films of all time. It had effects equal to Jurassic Park but for television and in much greater numbers. Today we have improved to the point where we can make anything. True sometimes digital effects today don't always look good but it is a matter of cost not technology. In my opinion Gollum looked just as realistic as Frodo in Lord of the Rings.