I always love it when someone says 'NO one is ever...'
That someone can believe with absolute certainty that something will fail...
For the record, I believe this is all coming way faster than we realise - and that this is a good thing.
Slight thread drift, but I met one of the senior controllers at Belgocontrol last month. He confirmed that pilotless planes (and equally automated airspace/airfields) cannot come soon enough (from a flight safety, not job security, point of view).