They are just trying something new with blue mage and trying to add some contents in the minor patch so basically blue mage is what it is. It's just a filler. This idea of making blue mage as limited job is kinda killing the job considered it has its own progress and party oriented. people who start late will probably having a really bad time and they will stop bothering about blue mage. Balancing blue mage to become a normal job will take some efforts but it's doable. It's just whether they want to do it or just making a new class instead.