I think a more integral supply system would be cool. maybe not necessary forced to resupply by air but could you imagine if to take a base you didn't need to flatten the town at all, instead you just had to cut off the supply lines and 'starve' the opposing side out of the base. For example, if the supply lines to a base is cut, then your fuel/ammo supply dwindles until you can't up a airplane from the base or roll a gv from it. This would have a 'more realistic' twist to the scenarios.
I'd have to see a more in depth explanation on your idea and maybe if you and your squaddies think it is good, you could craft up something organized and well presented in the wishlist forum, Hitech will definitely take a look at it.
All I know is that the current system is as stale as year old bread.