Originally Posted by charl_huntress
I think trilogies are the norm because it has the established beginning, middle and end. Most people are geared for that. Plus, I think it is hard to hold onto one actor for more than 3 movies. Just think of the physical conditioning Cavill would have to say in for years to play Superman.
TDK trilogy took about seven years, Raimi Spider-Man six. Yeah, if there were four Superman movies with Cavill, he'd have to stay in form for the good part of a decade. That's not to say he couldn't do it.