The only problem is bases are so easy to capture, when Mindanao does go away it's back in a few days because all the other maps are reset often in a matter of hours. For some reason Mindanao lasts longer, probably because of the hilly terrain making it tougher to sneak in a goonie.
IMO a fix would be placing VH's in towns (or at least a spawn point for vehicles), making both the VH and towns tougher to kill, and adding more anti-aircraft guns over the towns.
Heck, make the towns tough enough to kill that it's only practical for people to use B-17's or Lancasters against them--that'd give the bomber guys a real role in AH.
J_A_B