It's going to be interesting to see where it heads from here. The fundamental factor limiting a bigger Burning Man population is the two-lane highway leading to it, and there's no world in which it's worth widening a highway-to-nowhere just so an extra few tens of thousands of people can go party in the desert for a week.
Scarcity is going to be the new normal for Burning Man.
I'm Dr. Yes, a 10 year burner. I run this site, was on the '15 Temple team, lead a theme camp called Friendgasm, and make Burning Man videos. Just say yes, folks, and help keep Burning Man weird!