Please do not tell me you have not read the following report
Sunfish
You are not dragging that one up yet again as your supreme example
I dont think there is a soul here who has not read that report half a million times.
That was a dense ash encounter at night who here has ever suggested that you will not get a serious problem by flying into dense ash at night?
So whats your solution close down masses of airspace for long periods of time in response to mass hysteria and and a tiny un proven risk while there are far far greater risks you are prepared to take which are proven time and time again in aviation.
Oh well Sunfish with your approach there would not be a problem as there would not be an aviation industry! Get Real
Pace