If we're gonna compare Apples to Oranges here, the only point I want to make is that we'd like to offer Apples AND Oranges. Some people really like Liberation -- and Insurgency is a great game mode as well. Public servers are always going to have the element of Blueberries running amok and doing things at times that have to be undone. My solution to that was always scripting. If a mission has elements that need adjustment, it should be scripted into the mission the way PITN added SOAR elements on a menu for select individuals in A2 Insurgency because Blueberries would not do good things with access to the special heavy aircraft he added to his SOAR menu.
AI Squads could have a script that allows them to be dissolved if their "master" has disconnected for longer than 10 minutes, for example. Perhaps there can be another script to deactivate AO's that have been activated but are not actively being attacked by a human player for a set period of time. This is the power of Arma scripting - it's not hard to do most anything, and for the harder tasks, there are resources and communities devoted to making things like this. I'd prefer this route to shutting down a popular server and using it to clone one of our other servers.
If Insurgency Tanoa is getting old, we could swap it out for the Insurgency Altis, but I'm not prepared to shut down the Liberation server because it has a few dedicated regulars as well as a small public crowd that enjoys it. Just look at the GT list of players, I recognize several names on that list. I don't want to shut down their game to duplicate one of our others. In all reality, if Savage and Poff weren't so busy lately, they'd set aside a week to upgrade this VG Master Server running everything - it's still on an Intel Haswell setup, and the latest chipset servers are the same cost per month - meaning that we could nearly double the number of servers we are currently running negating the need to remove a server such as Liberation in order to add an Insurgency Altis server - eventually, we'll be able to add another Arma 3 server if we want. But for now, I think we should continue to offer the variety that we do.