This is not about FAA Part 135. It's about removing the distinction between RPT & Charter in favour of the catch-all "Air Transport Operations".
Part 135, for the countries that use it, deals with small aircraft carrying paying passengers.
Part 121 deals with large aircraft carrying paying passengers.
Whether you're paying via an agent (charter) or paying the operator directly (RPT) won't make difference to the level of safety. The only determining factor for level of safety will be size of aircraft.
As far as this goes, welcome to the 21st Century Australia, the rest of the world has missed you!
The issue at stake here, is whether CASA can turn what should be a 200 page document into a 2000 page document, as they have successfully done with Part 61.