With the low MA numbers today, why do you want to lock them down on their field and force them to leave the area? We don't have very many newbies who will keep trying to up from the hanger giving away free and easy kills. In today's MA they will either go somewhere else on the map to play or show up at 25k and pick you to death while you circle the dead field waiting to pick them. At least with a functioning runway and some amount of ack, they keep upping to fight.
As for the AI idea, an all AI base object yes. A few of those in every country to spawn fighter sweeps to help besieged feilds or some such role. Put horribly accurate ack on them and try to shut their runway down. Then incorporate that object's dynamic into the MA game dynamic. We already have the ack base which can be locked down to auto ack only. But you can land there and safely tower. Maybe Hitech can adjust that object's dynamic and manually add them to maps in some order. Then while you are capping a feild and picking the defenders hiding in their ack. AI can show up and pick you unless you bomb the AI's runway.......