That is one AI CEO out of 10,000. Just because OpenAI may not be interested in a larger model in the short term doesn't mean nobody else won't pursue it.
Others might pursue a smaller model that works as well as a larger model. If that can be done, whoever does it can very effectively compete on price/performance.
It seems that to assume otherwise (the only way to improve is to get bigger) is to assume that OpenAI already has found the optimal architecture. That seems unlikely.
