Earlier quoted context omitted.
Won’t this be resolved the way it does on Reddit with people ejecting to more specific communities? I’m a feminist for example, but I’m no longer welcome in mainstream feminist subreddits, so I subscribe to various more-specific-feminism subbreddits, and explicitly debate friendly ones.
I'm not too happy with that resolution though, because it leads to problems. While it may seem to reduce short term conflict, it exacerbates the effect of many of us living in ever-more-impervious bubbles. Which could lead to larger problems down the road as people's shared understandings about reality diverge even more.
OTOH, if enough people really want all those bubbles, there isn't really anything you can do to stop them.