If a third server were to be "deployed", I believe rotating maps a decent idea. Outside the two already on their own, there's a lot of contention on which map is the best and taking just one might be alienating some potentials. If a shorter rotation were chosen, I think there are a couple of fantastic third-party ones out there (Paysage, Solerno, and Anvil), but most gamers aren't aware of how good these are and seeing a server with them on it, might discourage some new players from getting on the server... Putting the other official ones on and having short rotation times I think might get people on for varieties sake..... Perhaps 20 or 30 minute map times... and I think you'd get lots of people on them. With shorter rotations, you might even be able to work in a couple of these third-party maps and keep everyone happy.