I think the problem with revolving doors is that we disagree about the direction in which it should turn.
The point is moot, because it will be introduced whenever it becomes cost-effective and they can convince the public to use it.
Winn-Dixie Supermarkets here in Miami started using self-service cashiers, but they lost a lot of customers. Winn-Dixie is notorious for putting a low price on the shelves and then the register rings up a higher one at the check out. With the self-service cashier, there is no one for the diddled customer to complain to. They also only charge the prices on "special" to those who present their silly little card, so they can trace every purchase you make.
I have not darkened their door for five years now.