Well, I could write a whole tome on what direction I think the WWI arena should move. But I don't want to get into that right now.

In the short term there are 2, maybe 3 changes that I think would make a big difference:
1. I think a lot of the problem is due to the fundamental base layout approach. I think HTC missed out on leveraging their destabilizing triad balancing scheme that I think works actually pretty well in the MA. the current WWI arena design essentially becomes a series of 2 country wars. That will always lead to an eventual imbalance that will self reinforce. The third team is not easily within reach to perturb the trend. The furball lake in the DA is really a better arrangement. All 3 countries are within reach of each other simultaneously. If one country has too many numbers, usually the other 2 countries will gang them, thus evening things out. Its a self balancing design. What I'd like to see is a small map(but maybe a bit bigger than current). Distributed around the map are triad clusters of rook,knit,bish bases. A trench system between bases (ditch on your side of the trenches and its a ditch not a kill). The clusters of bases are separated by enough distance to discourage crossovers, or perhaps a line of ack-o-death. Something like:

2. The ack-o-death chicks need to be nudged out of their nest. It was a fact of life in WWI that sometimes AAA got confused and accidentally fired on friendly AC. There was no radio to call them off. I propose that from the time you are wheels up, a timer is started. The timer is about 1.5x as long as the slowest plane would need to exit the ack area in a straight line. If you loiter in the ack zone longer than that, you start running the risk of be fired on by your own ack. The longer you hug ack, the more your own ack starts firing on you. The timer doesn't reset until you have died and re-up, or until you have been out of the ack zone some reasonable amount of time. If you step out and back in real quick, you will still get fired on.
3. I'd still like the option to raid and strafe fields. It should be hard and dangerous, but not impossible.
(edit: thinking on it further, I guess if you have #2 you don't need #3 and visa verca)
Just my $0.02,
Wab