I'm not too concerned about not having to level up a job separate from the class. For one, players coming in new are going to have a tougher time of leveling things anyway since once they level their first class, things will slow down a lot for them for the rest. Having to go through that 9 more times (even if only starting at level 30) is just unnecessary.

Between the actual job quests themselves and the other content in game (guildhests, dungeons, FATEs) I think there will be ample opportunities to learn how to play new jobs as they're added.