I agree with End and Duelle.

Although Time Mage seems like a rare species of class, which makes it very unique to its approach toward how you play it.
It's like one of those jobs that you can used to counter act an enemy during battle and at the same time enhanced your entire party defensively and offensively.

Also, due to how different jobs and battle mechanics are between FFXI and FFXIV, jobs can be modified in a way it's not always 100% like previous iteration.

If FFXIV still do well 10 years from now I wouldn't be surprise if there's a total of 15 class and 15 jobs assuming they keep the current armoury system.