You can look at comparables to see how that'll workout

Arguably the most mainstream and well-known subscription company is Netflix. People all around the world know about it, most have subscriptions and yet it hasn't "taken over" the world.

That's before we consider any other company (Anthropic, Google) can undercut OpenAI in price or just simply be good

Unless something drastically changes, OpenAI will have tough time justifying high valuation.