The server was empty in the middle of the day so it was changed to something else.
considering that turbine is one of the most played maps in the game besides 2fort, I don't think its because of a popularity issue. It's or less people have jobs and school (which started up very recently for many players who are younger). Another thing to mention is that this turbine server developed it's own culture beyond what you'd find in the other turbine servers that you see all over the browsers list. There were regulars such as I, Guts, Jrayko, Retrospect, and many others. The server was a second home for us is one way you could describe it.
Another reason why many of us haven't just gone to the turbine+ server is because we find the 32 player count for the map a bit excessive to play in for a map that small. The map becomes a lot more spammy and spawn campy more than it already is. With less players you have a lot more ways to play the map.
But if you still don't want to change it back bc you want more map variety, perhaps you could make it a general ctf server much like how the "payload la" was originally "upward la." Its not often you see something like double-cross or well on the browser. You could even add workshop maps such as convoy to the mix.