Unforutnately, the way the arenas are set up, and their small populations, large maps are not in our forseeable future.
You put a large map in a arena, you'll be hard pressed to find a good fight.
Now, if you meant taking those large maps and cropping them down to something managemable by our arena populations now, then sure.
And again, I'll whine

that ONE late war and alternating early and mid war arenas might help with our population shortages for those that like early and mid, but rarely enough people there for a fight.
The sliding cap for the late war arena should handle their numbers well enough, but I do know a lot of us are in late because we can find a fight there, but would prefer to fly early or mid at times for different plane match ups.