As for the Flight Engineers, out the door as no longer required, on 'modern' types'...big mistake IMO but nevertheless, a fact.
As for the Concorde pilots, it is
NOT their decision, the management pilots call the shots, like it or not....and most won't.
Tough beans.
IF they 'walk out', sack 'em
immediately, period.
If these turkeys had wanted to be the big shots...they should have applied when the position was offered.