There are advantages in things like braking consistency that will let you pack more trains per hour down a tunnel with automated systems. London's underground rail network increasingly has this kind of automation, where the driver presses a 'go' button and the train takes itself to the next stop, in the key bits under the city centre. It has a fairly high capital cost, though, and doesn't save you the driver, as the LonRec article shows.

The main people who want fully driverless systems are politicians who hope that no drivers == no strikes and lower salaries. Though honestly that would just move the labour power to the control room operators, even if there were a good financial case for the upgrade (which there isn't).