This is my thought as well, mostly. I can imagine long haul scenarios where there are multiple trucks with just one driver. With the ability to have that one driver take over driving the lead truck and the rest follow. A sort of virtual train.
I think it’s much much MUCH longer out than we’re thinking before there are trucks driving completely unsupervised along the roads.
This could reduce the number of drivers or it could increase the amount of cargo being moved. Either way, it’ll be more cargo per driver, but not some complete elimination.
*Drivers taking over from a stopped scenario, not some immediate change of control. To lead a convoy through some condition that the automation cannot determine on it’s own. Like right after an accident when some complex detour is required. Normal operation on the road will be automated, stopping to change control. Not the ridiculous “beep, TAKE OVER NOW, at 60 MPH”. 
