And the real truth is that there is no actual need for a driver on a tube train - witness the Dockland Light Railway - or the Gatwick shuttle.
That day may come for the airline pilot - although you will not find me amongst the SLF
Meantime in Scotland we still have a situation on some local trains where the man whose primary job is ticket sales (there being no ticket offices at little stops) rushes off every two minutes to open the doors. Demarcation is alive and well in what used to be Red Clydeside.