I agree with Hooligan, there were often big imbalances in Warbirds.
And a two sided war in AH would just have the same problem as now, but maybe worse.
I dont think there is any way HTC can institute any way to correct or prevent imbalances. Certainly you cant prevent squadmates from flying together, so there cant be any way to force balance. Award points based on numbers? Might be some thing to it, right now we have a system that awards big points to a reset, and resets normally are won by big numbers on one side. So, we right now award points to the big sides.
Maybe a mathmatically increased point award based on country numbers would work, points awarded would be increased by a slight modifier depending on reduced country numbers?
There should be some advantage to fighting as the underdog.
dago