Thanks for the quick response. That’s awesome news!
Sounds like this (without SSO) is something that could work in the foreseeable future then, without much work.
As I see it, Discourse also has a benefit in that it steps into territory that the WP plugin-based fora do not cover. As far as I know, they are not able to share “community users” between different WP installations.
It makes it possible to elevate Discourse to a sort of “hub” as mentioned. Not “only” a forum and not “only” a backend to one single blog/site.