[Ironhorse]

They reboot a franchise when they get too far from the origin story. An origin story is easy to do, and perhaps a spinoff with a cool badguy origin vs. the hero for a sequel, but a new story that gets away from the origin is too risky, so hollywood almost never does one.

These guys can't identify new cool ideas, nor can they recognize good scripts, so they look for something that seems to have mass appeal to a target demographic and green light it. Then its on to the next new fad.