Would you get on a plane that only had one pilot?

That whole idea went down the tubes in 2015.

Germanwings Flight 9525 crash

In 2015, a Germanwings (Lufthansa low cost subsidiary) flight was deliberately crashed by a suicidal co-pilot. He laced the captain’s drink with a laxative, so the captain would be forced to leave the cockpit for a toilet break during flight. He then locked the cockpit from the inside (a mandatory post-9/11 security feature) and set the autopilot to fly the plane into a French mountain.

The pilot and cabin crew desperately tried to break the door down over about 15 minutes while the plane was descending into terrain. They failed, everyone onboard died. A new security feature emerged, no pilot or anyone else may ever be alone in cockpit during a flight. From that crash on, if one pilot leaves the cockpit for any reason, a member of the cabin crew must sit in the jump seat to watch over the other pilot.

If you need two people in cockpit to prevent murder-suicides, they might as well both know how to fly the plane. Plus having a copilot is a useful and cost-effective way to train new captains.

This is why single pilot airliners won’t feature anytime soon, likely ever. Zero pilot airliners are more probable than single pilot thanks to that crash.