Keep in mind that there are other options to handle the release of Stand Alone Jobs for FF14.

One way they can handle is that...

they keep classes so Classes can serve as starting (aka Basic) classes and their Jobs serve as starting Jobs. At 3.0 point they will no longer release new classes in 3.0 but instead add in new Jobs as Stand Alone Jobs.

These Stand Alone Jobs will most likely not be playable at the Start like how Rogues/Ninjas are but they will not require any special condition to unlock. However, players will be required to find these Stand Alone Job Trainers some where in the World.

Think of Stand Alone Jobs as those special secret Jobs in a RPG (well not really a secret) where Players can become these secret Jobs anytime they want at any level as long they can find and reach the Job Trainer loction somewhere in the World.