There a conflict here though. What we need is more numerical participants, not just numerical concentration of a relatively tiny number of participants. Bitcoin at its current scale of usage will just wither and die (or be leapfrogged) if it doesn't grow a lot, so concentration of the existing users is fairly pointless. I don't think anyone disagrees with this?

The context of forking was allowing more rapid technical innovation, with the economic assumption that most participants would relatively quickly concentrate on one fork anyway, making that the successor.

If that economic assumption turns out to be untrue, then it is obviously the case that the needs of some participants or potential participants are very poorly served by one of the forks, and overall growth will suffer by failing to address those underlying needs.