That all depends on the show and how they budget for things as they grow.I strongly suspect that in your preferred a-la-carte model, there won't be a large enough audience base for the vast majority of individual programs to economically sustain said programs. Programs become economically sustainable when large numbers of people with different tastes all essentially share the costs of sustaining their programs together, even if no one person watches a majority of those programs.
Under your system, I think we'd end up with a few mega-hits and a few ultra-low-budget shows, and not a lot in-between. Goodbye large amounts of content, goodbye content diversity, and goodbye mid-budget programs.
It can go any which way.
Given the volume of sports fans, as long as they cater to what they want, they will do fine.
Same with most big drama shows.
For those with lower budgets and less viewership, you'll need to be innovative.
Just look at the YT model and how some channels are HUGE while others fall onto different parts of the spectrum for size.
Even with Netflix, if shows don't pull in the ratings / viewerships, they get thoroughly cancelled.