Yes, air traffic control needs to change because more and more planes are in the air and need to use the airport facilities. We have to come up with more efficient use to airspace and airport surface. Computers are good at this. They can examine millions of possible combinations of things, and tell you the best one in just a matter of seconds. We will have humans involved for a long long time.
Computers only know as much as they are programmed to know.
Humans perhaps can't remember as much as a computer can store, but humans can reason and project, and make decisions based on less that perfect data. Humans will do more monitoring of air traffic, computers will suggest the best altitude, speed, heading, etc. What actually do you do - we are in middle school. When I first started working here, I wrote computer programs that helped run a flight simulator. Programs are needed to tell the computer what to do when, and how to compute the forces for the particular airplane you are simulating.