They can't move to Nashville because the actors won't move with them. They can incorporate in Nashville but who the fuck cares anymore? If you're not going to pay taxes in my state why would I care whether you incorporate in my state?
Every single time we suggest that companies stop screwing us over we inevitably get told that they will just take all the money and leave. Then they don't do that because the only reason they're here in the first place is some other thing like well, California is a nice place to live and the people who they need to work for them want to live in california, and then they don't leave even though they threatened to.
If there is a cheaper place with less regulation that a company can move to and still have the same resources available they're always going to do that immediately and no amount of appeasement is going to keep them around. More importantly if they're not contributing anything to your community and they are just taking let them leave.
There is plenty of other things people can do in California that are productive besides make movies. But again that's all a moot point because they're not going anywhere no matter how many threats they make.
I mean not physically. Like I said they might try to incorporate in another state in order to do bad things to people but who cares again because they are still going to have to hire Californians because the people they want to do the work want to live in California.