Big maps during prime time only, then SWITCH to small maps during off hours. Experiment, and tweak the hours so that large maps may start earlier and end later on the weekends and holidays (gives the off hours crowd some time with all maps).
I believe that HTC still has that coad that allowed them to save the arena status and reboot with a different map. I could be wrong they might have just shut down one map and restarted it where it left off the next day. Anyway, if that could be done, it would make for a nice change when maps get stalemated.