The only thing marvel should do different, is they should start shooting 2 or 3 movies back to back. that way they can have a staggered new release every 3 months. kinda like this...
Fall Iron Man Movie
Winter Thor Movie
Spring Cap or Hult Movie
Summer Avengers movie
release the movies on a more regular basis, similar to a actual comic book schedule, instead of ramping up new production every 2 years.