Management preparations are already underway for driverless trains

“When the Jubilee works are complete there will be three lines in London – the Jubilee, Victoria and Central – which will operate on an automated system,
It is a fact – though not a widely known fact – that as we speak most of the Jubilee Line currently operates under automatic train operation, from Stratford to Neasden.
In other words the driving of the train is done by computer rather than manually
Of course there will still need to be someone aboard the train, but thanks to the advanced signalling being installed it is also a fact that anyone in this room could in a matter of a few weeks acquire the qualifications necessary to supervise an underground train.
The huge potential implications of that change will be obvious to everyone.”
Boris Johnson, January 2011

See the attachment for a Regional Council report on LU's proposals for driverless trains.