and why would they? ........... they are pretty happy with what they have now.

Exactly. Only a very small number of people are motivated as the pioneers who've setup the fediverse now are. Again looking at this through the lens of r/futurology & our fediverse site. Why would a user also want to go to a second version of the exact same thing, but way, way smaller.

My hunch is that long-term the fediverse will prosper. Reddit still isn't too bad even with these changes, at least not compared to what an absolute shithole Twitter has become.

But people who care about making it bigger, should be asking themselves hard questions - this meme comes across as very complacent & out of touch, if many people really believe the sentiments it's expressing.