What is going to happen is reverse of what you say you want. The big Hollywood blockbusters will be just as available as before, what you are losing is the long tail of smaller independent films that may be more thought provoking or diverse.

If some streaming service has to cut 80% of its offerings, they will keep the Transformers and Marvel movies and cut the smaller ones.

Even if they made more specific regulation to remove those blockbusters, which will annoy the general population, almost all regulation benefits the large incumbents in the long run. They have the resources to figure out how to game the system.