The wot is a great feature, probably would cover the top 20%ile of individuals who are within 4 follow distances. Though, that bottom 20th percentile of individuals who are within that distance you really don't want to see.

The Wikipeedia approximation and enhancement from nostr and WOT could work with a default score set high, but having even more specialization and mixing would be enhanced through the tools that allow you to configure how open your community is, and governed by a subset of stakeholders for the relay being operated. 

Finally, the users will settle into some Pareto Optimality of engagement in any such community: some may be appointed moderators in a community, or an individual just interested. The Reddit community model is great for this type of interaction, just that its centrality can remove individuals from that entire network of which nostr removes by design.