A single LLM provider might have been able to get great margins and capture a significant fraction of the total economic output of (currently e.g. junior grade software engineering), but collectively they're in an all-pay auction for the hardware to train models worth paying for, and at the same on questionable margins because they need to compete with each other on cost.
They can all go bankrupt, and leave behind only trained models that normal people won't be able to run for 5 years while consumer-grade stuff catches up. Or any single one of them might win, which may not be OpenAI. Any or all may get state subsidies (US, Chinese, European, whatever).
All kinds of outcomes are possible.