As long as RethinkDB is AGPL most will just stick with postgres.
Is it possible (or likely) to get the creditors of Rethink to change the license?
Did you have to create a throw away account just to shit on AGPL? (this is the second thread on the topic rethinkdb you are commenting exclusively on the AGPL license).
Please list a few successful open source AGPL projects with a significant user base.