First you'd have to have a reason for Recon and bomber planes to get to 5 - 8k.
Then you'd need fighter sweeps to intercept them, and escorts to protect them.
While I enjoy the low level furball, it needs things other than that to keep people interested.
I think the way the numbers have dropped off shows that pretty clearly.
Balloon busting, convoy strafing, zep hunting, things to do other than just endless furball.
These will all help keep people in the arena, flying around. Scattering the fights, getting people to different altitudes, etc.
It doesn't necessarily have to have anything to do with winning the war. It has everything to do with giving people something different to do when they've been shot down 3 times in a row in the furball.