I think the less tied down we get to one actor being THE [insert comic character], the better quality movies we will have. Each movie is going to try and tell a different story and sometimes an actor that worked great for one story just doesn't work well on another. If they were to establish the characters over the faces playing them, it might be a bit harder to get repeat business. How many times have you heard a list of three hopefuls and been disappointed by the final cut? I have. They should have to pay ridiculous amounts and sacrifice post-film editing and CGI to pay some guy who knows they'll need him for a sequel.