I do know transferring people between servers is possible, at least I remember something like that happening before. I am a strong proponent of this, as it would probably end up with a higher player count. A few things to keep in mind:
Would people want to be changed? Maybe they only joined because of the 50+ players. (Very few, probably)
If people were with friends? It's possible they wouldn't be on the same server. A small inconvenience.
It was something good, but I forgot. Possible edit later.
Emphasis on the underlined part, I think this applies specifically to my map as well. There is no way it can hold 60 people.
Anyways, I am only a proponent of higher player count until we can get something like automatic server switching, as described above by Schmitz. While it does ruin some aspects of the game, I don't think having a 40/40 server during the high-times would allow as many people to enjoy the game. This might lead people to not even starting the launcher or even bothering to check, which I wouldn't like.