Whilst a crash doesn't happen very often, that's not the only thing that would cause the ARFF to turn out. But doesn't mean something couldn't be implemented I guess.
I don't see why providing Unicom services on a 'when practical' basis can't happen. Sure, if the firies need to be doing something else, go do it, but most of the time they are hanging around waiting. Having a Unicom most of the time is still a whole lot better than none of the time.