It's true that Hollywood blockbusters have become prohibitively expensive.
Do you really think that mainstream American TV/film viewers will start to watch low budget foreign films over their Michael Bay dreck? Foreign produced movies and TV will certainly get a larger share than before, but they will always be a niche. Most American viewers will not even watch something that is not high budget.
And if foreigners did manage to create something Americans wanted to pay for more than American produced entertainment, wouldn't they...deserve it?
And wasn't America...ummmm...founded on multiculturalism? Give us your tired, your poor, your hungry? There was no footnote saying 'If you speak English and conform to us'. No, it is not 'Cultural unity or multiculturalism'. America takes a little from every culture. That's the definition of America.
If you don't like it you can 'git eht'.