My point was many adults do have unrealistic expectations of success. Sure, most people don't start restaurants, but an irrational amount of people do it thinking they'll make it. This is hardly unique to restaurants, this was just an obvious counterexample to poke holes in his argument. I live in San Francisco and see people start companies for the stupidest fucking shit all the time, convinced of their assured success because of their Ivy league degrees. I also watch as almost all of them fail (some just haven't had enough time to fail yet, but obviously one might surprise me some day).

Questioning his assumptions is not meant to refute his argument, only to question it.