It will never happen, but yes it is a very scary concept. Another scary thought is that people are so dependent on software and computers they would not know what to do if for whatever reason there was an extended power outage or worse. Can you image if cashiers had to figure out your change without the register telling them how much money to give back to the customer (when they use cash that is).
Back in my day it seemed the big high school project was the hover craft on the basketball court. I think the robotics competition draws a bigger crowd!