Leo wrote

If the Amateur Radio Service did not exist, and
was being proposed as a new service in 2003,
what would it look like?

Your question requires the respondent to accept the false premise that
Amateur Radio is a creation born of regulations. It is in fact a
creation constantly being reborn, evolving over time by the influence
of its' members, and the regulations in force at any given time are at
best a reflection of that influence.

Thus, the notion of creating a "new" Amateur Radio Service out of thin
air without regard to its history is akin to asking "if the
Mississippi River were being invented today, where would it run?"

73, de Hans, K0HB