The number of tellers is expected to drop by 12% over the next decade while general jobs are expected to grow by 5% according to government forecasts btw.
Being a cashier used to be a tougher job because you needed to know all the inventory. Now it’s ok for a grocery store cashier to not know what parsley is.
If automation makes it practical to do an embarrassingly small task in order to provide a value to someone richer, yeah, you can be hired into it. Maybe a lot of people will. But that’s not prosperity that’s capitalism holding you by the balls.