Substantial research showed that 128-player battles just aren't fun to play!

128 players is the way to go it's a war chaos is apart of that however better map design and voice chat are essential to the success.  Map design that drives a balance between troop and vehicle movements. Something that would go a long way to balance the air superiority that often takes place is AA Vehicles should be their own category with a limit of 2 or 3 minimum for large player games . And a class system would also help the balance for larger games as specialists as they are drive a lone wolf player approach which doesn't work for battlefield .