It would be interesting imo to remove classes. Honestly Arcanist may be the one class keeping this from happening. However this can be nullified by reworking both scholar and summoner to possibly have different weapons and give scholar more... "fitting" attacks to fit the job.

As for the class quests, I see no reason to remove them, with the accepting of perhaps making a new start "class" series for scholar, or maybe making scholar work as an extra job does, unlocking @ 30.

They are an extension of the jobs themselves in many ways.