...and by the way AI isn't any of the 5000!

I think you're right that many more people are in theory capable of joining the group, but not that the industry is conspiring to keep it small. If anything it's the people who have an academic history that stretches back to childhood that end up dependent on having someone to guide and grade them. Beating your own path through the wild is scary, uncertain, and often thankless, so I think you'd only want to do it if you already felt sure you were among the most motivated and dedicated members of a group.