I'm confused why elon says 2/3rds of shareholders would keep invested in a private Tesla. How would they ever get their money back out? Only if they went public

I'm confused why elon says 2/3rds of shareholders would keep invested in a private Tesla. How would they ever get their money back out? Only if they went public in future or if they sold to another party? Based in their market cap compared to GM, Toyota, etc. that seems a bit crazy.