Just dropping in right quick and saw this. 2 thoughts and I'll be back out in the wilderness another several months.
1 - keeping servers up-to-date wasn't as big a deal when I was around, in what, 2007-2008? maybe that's become bigger with the new steam update demands, if you can't access a "old" server with a "new" client. Sounds unfortunate.
2 - yeah you're going to need some admin staff to keep the server chugging. I had to stay into it at least once every couple of days to gauge the server satisfaction and see any tweaks that might help (including the surprisingly successful termination of map voting back then). However, it also makes a big difference having server regulars. My pool of players was admins (CL = me, and whatever I called my priviledged peoples with admin rights and toys), WCU students, and the public community. The admins were pretty reliable, the public were my #2 group for keeping the server populated (students take off for class, but the dedicated public did great keeping us above just a bot scrimmage), and students were the #3 crowd. However, I'd say on average there was a fair tie between WCU students and the public number wise, with the admins being only a handful. Measure out the current server that way (maybe break it up into daytime and evening "shifts"), and see if you can get some regular attendees there. Take these measurements, because you may have to tweak the server to tailor it to those crowds to keep them coming back. Having regulars made all the difference in keeping the WCU server popular and well-appreciated back then. That point precisely is where your admins come in. You need them to pop the server and develop an admin staff, and to make sure to keep that core group of people happy so they stay there However, that should just be a lesson for the future, y'all are shifting into summer gear and will be so-so for a while.