So many arenas, so little activity. MA, DA, TA, and SE and AvA all that is needed. Have you noticed the trend in building newer stadiums, they are putting in less seats. The perception that most folks have is, if nobody else is in the arena, it must not be fun (self fulfilling prophecy). So, if the WWI idea comes about I would like to see it replace the redundant main arenas.
Or, another idea:
Split Main arenas into Pacific Theater with carriers, European Theater without or very limited carrier use, North Africa Campaign with super Tank Town battlefields.