some of those postions are automated.
"Thankyou for your call, your call is important to us. If you require help with your widget press 1, if you wish to ...."
used an ATM lately?
I have seen a few petrol outlets here in oz that have an eftpos swipe on each pump, you don't even need to go into the shop anymore.
In most things we do, there is a way to do it without any human interaction.
I think though in these times when more and more people in society are time poor, we will need people who will do things for us that don't need our level of expertise (read pay) to do.
There will always be a tesco manager because the manager above him gets paid a lot more money but has excess skills (read pay) to do that job.
Some PD person said (I can't remember who it was) if you want to be paid $50/hr then spend your time doing $50/hr work, don't spend your time doing tasks that can be done by someone making $25/hr.