It becomes feasible when people are willing to pay more than it costs to run it. But I think this will be a pretty uphill battle, as many use cases are hard to monetize (eg proofreading) and for many use cases you will feel pressure from smaller models (you don't need the most expensive SOTA model to generate an email). There is probably just a very limited amount of use cases that are in the goldilocks zone with their difficulty so that people will be willing to pay for them, AND AI is able to solve them. I think programming might be one of them.