I started to write a comment of my own then saw this one. You are spot on with this. What needs to happen is exactly what you are saying. However, I think human

I started to write a comment of my own then saw this one. You are spot on with this. What needs to happen is exactly what you are saying. However, I think humans in general tend to like to see the same actors in movies time and time again so finding a way to decentralize production but still keeping popular actors involved can be a bit of a challenge. From what I understand, the actors unions are probably currently limiting some talented people from becoming well known actors so balancing this out could help as well, however I don't think we can get away anytime soon from the appeal that certain people have to audiences, however the rest of it is all interchangeable, in my opinion, writing and special effects work can be done anywhere as can the actual filming of the movies.