Earlier quoted context omitted.
Most of the weekday traffic is business travelers, who have meetings scheduled and need to be guaranteed on the ground at a certain time. That would certainly work for a lot of leisure travel though. Part of the reason why it's considered a sign of a civilized country if their trains run on time.
Actually, I think it would work a lot better for business travelers, since it optimizes for minimum wait time at the expense of, well, expense. If you take a commercial flight today, you are guaranteed to be at the airport for 1-2 hours, and chances are you'll pad that out a bit if you're headed to an important meeting. If you billed your time at $300/hr, wouldn't you pay a little extra to know your car-to-air time w…
On a leave-when-full plane, you may be there for any length of time from 20 minutes (if you are one of the last to arrive), to maybe 2 hours (if you are one of the first to arrive), to maybe 4 hours (if you arrive just as the last one leaves, and there isn't another one arriving for a while).