I think it's pretty obvious that crypto is actually leaning into tribalism.
There are already thousands of them with tens of thousands more to come.
Crypto as a whole will be able to accommodate 1B people but I highly doubt that they would all be using the same one.

There's also the issue of user experience. Networks with the most users will also be streamlined and super basic, to the point of the users not even realizing they're using crypto.

Lots to think about.