I have a feeling that even though the "class quest" may continue we might see the "job quest" givers be involved via a potential integration of the class/job system. It's possible with the 3.0 threat and the Mighty Dragons that the first thought that comes to mind is Dragoons, what better way to train a mass supply of Dragoons than to speak with the Lancer guild and agree to exchange Dragon job crystals in exchange for their allegiance in fighting the Dragon threat.

With the 3 "jobs" being released it's possible that Ishgard is just well versed in their crafts that they not only know of the techniques those three fighting styles but they also have the job crystals to enhance the potential of those jobs to their limits. It's possible that those 3 jobs will be unlocked through Ishgard and Machinist won't be a guild that starts in LL otherwise it does undo my theory on that lol.