Yes, in real life country's had limited #'s of planes to work with, however, this is not real life.
Anything that limits what I can fly at any given time other than perk planes is I think looking in the wrong direction.
I just don't think that HTC is going to go there. Long term its a PR nightmare, and a huge source of whines.
Now I could see this being tested in the AvA perhaps.
Some special events already factor this in.
But for main arena play, sorry, but I just don't see this happening, nor IMO should it.
I agree 100% with Ghastly, the whole idea is that people can fly, and preferably, fly what they want.
I for one would love to see the whole strat game reworked, but doing so around limiting AC that people can fly is not
going to make for a large happy customer base.