Problem with you idea is transferring from low population to high population is what will create that queue time.
You are saying let’s move people from low server to high server. What do you think is going to happen ? You think people are going to get in and right away and start playing?
No what will happen is the large population server will now be over populated and all of those people complaining about how they wanted to go to the large population server will start going I want free transfers to lower population servers all because they played less on the high population server due to having problems actually being able to log in.
Best solution would be another round of mergers. They won’t do free low to high transfers because it will kill some of those servers and not everyone wants to leave their chosen server .