The article discusses how ATMs did not replace bank tellers, but the rise of mobile banking and the iPhone has led to a decline in bank teller employment. The author argues that the true force of a technology is felt not with the substitution of tasks, but the invention of new paradigms. The ATM automated tasks, but the iPhone made them irrelevant by enabling mobile banking and changing the way people interact with banks. This shift has led to a significant decrease in the need for human bank tellers.