the mass horde rolling bases unopposed in the last few minutes before everyone is ejected from the arena is taking what's already dweebish and moving it up to the next level.
But is it a problem? Not really. So they grab one base. Big whoop.
If it needed to be fixed it seems like it would be easy enough, at the point the arena is locked 10 min before everyone remaining is ejected, make all bases uncaptureable unless all ack or hangers are 50% down or more, or unless the town is white flagged and totally deacked. Otherwise at the 10 min to ejection point, a "snapshot" would be taken of the map and at the point the arena is reopened later on, this "snapshot" would provide the state of the map for when play resumes, not the point where everyone is ejected.
I don't want to put words in anyone's proverbial mouths, but I'd wager the intent behind giving 10 minutes between "arena lock" and "ejection" was to give people a chance to rtb, land and log without being disco'd, NOT free time to roll undefended fields after everyone else is gone.
But then again, it's not really a big problem, so why worry? Let the tards have their fun when everyone else is gone, heavens knows most of the remaining time when there's any opposition they just get clubbed.