The problem with AI in the arena is that people don't really want to dogfight them.
We have more wannabe fighter pilots than bomber pilots, so if we made an escorted bomber mission with a counter intercept mission, the fighter slots would often fill up faster I imagine, leaving AI to fly the bombers. I think that would be OK.
I figure people will occasionally pop in for a mission, if only for some gunnery practice, and the more people who do, the more will follow