as a matter of interest would it be reasonable to ask a flight crew, that is declaring an emergency, just what level of response they would like to be available upon arrival?
its seems to me that if as advised .....
"hyd fail on an an a340 is a non event - someone is blowing it out of proportion!! - if flaps stuck out, well then you obviously cannot continue to destination due to fuel issue but other than that not a problem"
..... then why not have the Flight Crew advise ATC to have a Precautionary attendance , but certainly not a Full Blown Turn Out of Emergency Services
If, on the other hand a Crew feel a "full turnout" would be wise then let them say so