This sounds fine in theory, but how would it work if the content were continuously changing? For example, the final straw that made my cut the cord of cable-tv was getting locked into a 3yr plan for cable TV only to get the Disney channel for the kids -- only to learn that Verizon/Disney had a fight and I lost the channel. https://deadline.com/2018/12/disney-warns-verizon-fios-custo...
Now, i'm still locked into the 3yr plan with Verizon but dont have the content I wanted. I know people complain about paying $10 or $15 for a streaming service, but imagine paying $100 for cable TV and being locked into a 3yr contract. I'd much, much rather have a la carte services I can pick and choose and cancel as desired.
However, if you're talking about the Amazon Prime TV model, then I'd totally agree with you. I think that is the ideal model -- Prime is a nominal cost (for now) and you can add/remove channels as you wish.