Technically they could just make a blue mage job but all the skills would have to be set and it would probably just play very similar to summoner.
The limited version is far too overpowered to be lumped in with normal jobs at this point.

It's probably better to think of it as a minigame rather than an actual job.

I think a large part of it's staggered leveling is giving bursts of activity in older areas as well.

I wouldn't say no though. I've loved blue mage since FFV