In my very limited experience of these things (I once had the privilege of being sick in the back of a Jaguar) low level flying in a fast jet is a very violent high pressure operation there is not much time for position reports. Anyway the aircraft round the next corner 5 seconds away probably can't hear you.
Personally I am happy with the ratio of aluminium to air being quite low but if society wants a solution surely that is Flarm ...
Bill