I think that I predict the opposite (conditional on what exactly is being predicted).
What exactly would count as a GPT-3 moment for fusion? How about an experiment demonstrating reactor-like conditions? This is roughly equivalent to what I referred to as ‘getting fusion’ in my book review.
My prediction is that, after Commonwealth Fusion Systems gets Q > 5 on SPARC, they will continue to supply or plan to supply HTS tape to at least 3 other fusion startups.
I would also make the same prediction for Q > 10. Or when CFS first sells electricity to the grid. These will be farther into the future, but I do not think that this culture will have changed by then.