My favorite example/rebuttal to this is: Imagine a car sales evolves to basically vending machines. You walk up to the box, pick a car, swipe your card, and a roll-up door opens and your car pops out. Amazing! No salespeople needed. Every town just gets a few vending machine!
Then one day, one vending machine owner decides to pay a bright kid to stand next to the vending machine in case the people have questions. Sales would go up at that vending machine. Soon all vending machines have a salesperson standing next to them helping people. And we're back to where we started.
(Unless you think a smart helpful person standing next to the vending machine would make sales go down I suppose... But this is against everything I've seen selling thousands of cars)