Response to Community Ran Servers:
https://forums.taleworlds.com/index.php?threads/what-are-the-best-server-hosting-sites-for-release.396614/post-9256622
As far as the matchmaking system goes. I feel it will be an awesome feature for ranked, but it should include custom servers in a filter.
Warband survived so long because of it's community and player ran servers. From a developer prospective though, they patch just about everyday, and it's easier to make changes and develop multiplayer when they can make all the changes to the servers and receive feedback from them. So While we want our own servers, we have to bare with Taleworlds and give them our support where we can.