Two comments come to mind. 
Chaosmagnet:  FCC rules do permit the use of ANY frequency in a life threatening situation.  I totally understand your point about using emergency frequencies as I was once an EMS dispatcher.  Not to mention, most public systems today are digital using APCO or Pro-voice and encryption.  My suggestion is to preface the call with "Please hold the frequency for emergency traffic" or "Mayday,Mayday,Mayday. . ."  and then proceed.  (just a humble suggestion from a fellow ham as well.)
Cellphones: Granted, there are a lot of areas where they are ineffective for a variety of reason.  IF one could afford it, keeping a satellite phone handy, would fix much of that especially if one is in sparsely populated areas.
K0WHH
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WesleyH