The idea of limited jobs as side content is potentially interesting, but for me, it's going to come down to how the masked carnival is implemented. I'm in theory fine with the idea of limited jobs being cut off from the main end game with the balance being they can go full ham with limited jobs, giving blu all these spells to go find without having to balance the job against the main combat jobs.

But if the carnival ends up being shallow, super short/easy, or something like that, it will kill the idea. Blu needs SOMETHING to do with all those spells besides just steamroll four year old content. If they can pull this off, I'll be fine with it. If the carnival is a let down and they don't add to/expend it over time as blue gets new spells/level cap...it'll feel like a huge waste.

Though I also understand why some people are upset that blue mage won't be an end game viable job. If blue mage was my favorite FF job I may well be disapointed that it wasn't just made into a regular job.