I think it depends on how TCRs will be applied. For example, I can contribute to a TCR for Y Combinator founders, Stanford alumni, Microsoft employees, investors affiliated with DIRT, cryptocurrency related topics, etc. The number of topics is already more than two. While people may be only a domain expert on a few topics, the number of TCRs you can contribute to may be far broader.
We’re building a general protocol to make it easier to experiment with TCR. It could be that the killer use case is different than what anyone expects.