I play a lot of free to play games. This business model is great because it gives the player a taste of the action and they will crave more. Giving a new player a taste of the action will hopefully leave them with a desire to pay to play the better more competitive planes.
The incentives dont have to stop there. Lets say I really like the P38. Maybe I could unlock decals or a "badge of mastery" for my plane as I get more and more kills. A lot of these free to play games offer these incentives so players will have something to strive for in the game.
Many of these games offer in game skins through progressional unlock or for a small payment.
Aces High doesnt really take itself to a free to play model, but adding some small incentives for free-to-play players could help them in becoming full subscribers.
I think if we get decent numbers in the MA, the game will start to become more sustainable in terms of people continuing to play.
I am alot like 49ZERO in which I have an account and could log into to play anytime, but I dont. Maybe its because my desk is to cramped for my joystick and im too lazy to clean it off. Or maybe its because many people aren't on.
I think that finding a way to concentrate fights with the numbers we do have is a good way to become more sustainable, I like the change HTC has done in regards to spawning players at the base with the most action.
Small tweaks like this can make a fight great. What if "objectives" spawned on the map that offered a large perk bonus; possibly a large factory to bomb or a target base that would output more perks for objects killed. Maybe players will even start organized missions to tackle said objectives.
I am not saying a full game model overhaul is necessary, just a few tweaks to promote fighting or giving some incentive to attacking one base before another rather than a spread out front line of multiple bases. You could even make base takes sequential like the old zone system so focus the fight around a certain area even further.
My final thought on the matter is sustainability. We need a way to make the MA have more action with the player base we already have. If we can get the current player base to play the game more it will be reciprocated by having more numbers to draw new and returning customers in.
I dont have any prespective from what its like to run a business, so this may be a pipe dream. Consider what I have said and try not to flame me too hard.
EDIT: Many of these free to play games constantly balance the game to promote a better player experience by shaking up the game every once in a while to keep players interested. This goes along with adding new content to the game.