The problem is that it could be just one human. One person could own all of the machines. They would advise him, protect him, and carry out all of his orders.
Just imagine the President having his entire White House automated. The NSA? Automated. The military? Automated. Police? You get the picture. Robots and computers replacing everybody. One person in charge. 100% loyalty. Small pockets of resistance trying to hack into and take over robots, data centres, etc. Vast computing resources under the ruler's command employing all manner of encryption, fuzz testing, logging, surveillance, etc. in an attempt to eliminate the resistance.
It's like the plot of the Terminator movies without the general AI in charge. Instead, it's a legion of special purpose AIs serving the one guy.
The steam drill didn't beat John Henry, the system of technology, resources, and people behind the steam drill did. Until a computer decides that it wants to win a chess tournament and teaches itself how to play, humans will always be at the helm.