As an example: I'm paying for Netflix and Amazon prime. I'm not going to pay for more services because I don't value watching TV more than that.
We buy or rent a specific movie maybe once a quarter at most.
So total expenditure on TV services is around $20/mo.
Almost everyone I know is in a similar situation. Some swap one of those services for something else, many are sharing subscriptions with other households.
So right now most people are paying a fairly fixed amount for access to a portion of TV and film. The total money flowing in seems to be enough to support the entire industry.
If a service that cost $20/month for access to everything came out, I'd definitely switch. I imagine most of my friends would as well.
Then the total money flowing into the industry would be the same, but everyone would have access to all the media.