If competing commercial systems are allowed, they might try to game the various systems as a matter of competition. To fix it, the regulation ends up being a form of government mandated mass transit.
Definitely an interesting scenario (not sure why you were downvoted). New enabling technologies may promise the potential for utopia, but human nature persists. If the standards for the technology can't come from competitors cooperating, we're left with regulation. Forgive me for repeating your point, but it seemed lost on some, perhaps unintentionally.
Where we will we get the new rules for a new road?
