But eww, Malboros have bad breath!
Servers with half your population are ~there actually appears to be people playing the game at various times of day~. When it's so populated that its active population could sustain like 3 other very populated, healthy servers, that isn't okay. And Balmung/Gilgamesh are auto-locked constantly due to online players. Therefore, they're overpopulated. By the dev's and by anyone who actually stops to think about it's standards.
According to the graph posted higher in this thread, you can clearly see that Balmung was at 26k or so "active" players for the month of March. Balmung is anywhere from two to SIX times larger than the other servers. That's the definition of Overpopulated for you.
Do you know what would need to go into re-design the game to accommodate your desires from it's current standards?
Also:
http://i.imgur.com/tOgJG44.png
That's a lot of only 5 people. That's only the aetheryte, too.
How about no? Others servers need players also instead of everyone thinking they all need to go to the same server.
I agree that some of the smallest servers could benefit from a merge, but you seem to be glossing over the midpop servers. Aether is not just "ghost towns + Balmung". With the temp lock + 4.0's launch, those mid population servers will fill in and hopefully even out some of the data center's lopsidedness.
Simple: put Balmung and Gilgamesh on their own server tree, then put Bahamut, Mandragora, Chocobo, and Shinryu on their own as well.
That gives all 5 servers more room, since it'll just be those together on those groups.