It has already been proven that Lucas had used at least 50% of practical effects and sets for the Prequel Trilogy. Or possibly more. I learned about this on THE FORCE.NET -
http://boards.theforce.net/threads/...e-prequels-sets-pictures-models-etc.50017310/ - website and in other articles. "Revenge of the Sith" was the only Star Wars film that did not shoot on location. Also, Abrams had utilized a good deal of CGI himself.
I have never understood the hullaballoo over CGI. To me, the arguments against it seem similar to those against the advent of sound and Technicolor. Have moviegoers, film critics and filmmakers have become
so conservative these days that they want movie making to remain stuck in the present . . . or the past?