So basically the way it would work is to have a number of mission slots to choose from and any unclaimed ones would be replaced by AI, so the scheduled missions would always launch.
People don't like to fight AI but it would be a mixture of robots and humans and in a lot of cases it would be the less desirable mission slots that would be AI.
For example, a large escorted bombing mission where a lot of the bombers would be AI piloted and the escorts and interceptors would draw more human pilots.
On it's own, it might not be a big draw, but as a part of a system where you had to fly in a certain number of missions to advance your virtual career, I could see it being popular.
Might not be something that could sustain itself 24/7 but run a few days per week, perhaps it could work.
A smaller version of this could be implemented in an existing arena, AvA for example.
Open play could be suspended for all day CT mission style play a couple of times per week, or it could run independent of whatever other activity was going on in the arena.
Any future improvements in AI capability would be icing on the cake.
I still think it's worth pursuing, but possibly on a smaller scale "Combat Tour Lite" if you will.