But here's an idea. If certain airfields with A/G were to share frequencies, that would free up some frequencies. Of course, all transmissions on the "shared" frequency would need to be preceeded and followed by the airfield name to avoid confusion, but I can't see that being a problem....
This happens now, normally an A/G freq has a DOC of 10nm/3000ft although in practice they are spaced much further apart than that. However, it does require greater discipline from the users which isn't always the case. Bourn and Popham use to share 129.8 and it wasn't unusually to hear a downwind call at Bourn which you had to assume was Popham.
I don't deny that there are legitimate uses for an air-to-air frequency (air-to-air photpgraphy springs to mind for one) but if one was so designated I fear it would be misused by the majority to the detriment of those with a real need. You only have to listen to some of the dross on 123.45 now on a 'good' day.
People have used Old Warden's freq to chat and I have to tell them to s*d off!!
VA