Great idea. Let's hand over the most high leverage innings to a punk kid who doesn't even know how to pitch. If you want to see the Red Sox become the Boston Celtics, then by all means, this move would be great. I just think it is very unlikely that Hansen has magically cured all his problems this off season.
Hansen should be nowhere near the big leagues until he figures out his problems at AAA. To be honest, I think he is going to end up more like Ryan Wagner than Chad Cordero or Huston Street. I just haven't seen any improvement from him.