Television is such an evolving medium. When you're doing a TV show it's not like you just shoot for six weeks and you're in an editing room with all of your footage. It's like a guitar or a car you have to fine tune things. You stop doing what's not working you work on what is working and you add things that do work.
I've never had any illusions about being a lead actor in films because lead actors have to be of a certain kind. Apart from the beauty of looks and figure which I cannot claim to have there's just a particular kind of ordinary-Joe quality that a film star needs to have.