In the long-term, I doubt that OpenAI will have a monopoly on LLMs. We're still very early in the development, and I don't see why other organisations, won't be able to catch up. The instruction-tuned LLaMa versions already look very promising, even with rather small & low-quality data sets. Compared to other technologies, the investment-requirements for LLMs still seem to be relativly low and something a number of companies or governments are able to finance.