I dunno about this. I REALLY like the idea of fragmenting the whole user base. When a community gets too big it ceases to be a community.
Why does the whole internet need to see then same content, and be a collective hivemind?
Whats wrong with the current user size we have on this current community? Id even argue its too big already. If it blows up by 100x we run back to having posts with 10k replies, 20 or so which everyone will read. Its a really dumb system