I haven't read the thread you're refering to (going to read it shortly), so sorry if my answer doesn't make sense in context... but why would eyebrows be raised by the flight continuing as planned? If the flight plan says LHR-JFK, and the aircraft experiences a radio failure, then as soon as ATC realise there's been a failure (either because the aircraft fails to respond to them, or because the pilot selects the code for radio failure (7600) on his transponder), they'll expect the flight to continue as per the flight plan. To do anything else might "raise eyebrows", I'd have thought.
FFF
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