I want a major role. Granted, I want airpower to be the controlling force, but army units should capture ground.
I like realism. Infantry units take and hold ground, so says the US Marine Corps. Who are you to argue with the Marines.
The bare minimum that I would go for is to have static frontlines that only move when softened up by airpower. Thus it only appears that the Army is winning, when if you step back and look it is the airforce that is the key to winning.
Or navy, in a Pacific campaign. Ships or army units that have no human controls. However, they wander up and down the "front" untill they find a hole, then go into automatic attack mode and poor thru the breach created by the planes.
Thus we have realsim, but we're only pilots.
Of course, I want to be a tread head too.