While I would agree that they need to add more activities to level up (with the hunting log being particularly useless as it's only a very tiny fraction of your entire XP to-next-level requirement), I would say that more quests is not the answer here, especially since, you know, they're just one-off activities that cannot be replayed.

I wouldn't mind seeing them redo the dungeon progression, for example. Rebalancing some of the older level 50 dungeons (which, frankly, no one ever runs anymore outside of the high-level roulette) to be run by sub-50 players, and making a new dungeon show up every alternating two and three levels instead of just every three, wouldn't be a bad way to go. A more robust hunting log with more mobs to kill for each level with correspondingly higher XP rewards would be helpful as well.

It's also worth noting that the armory bonus is quite helpful once you already have your first class to 50, so you can't discount that. Perhaps it should be even higher than it already is? I wouldn't be against that, really. Simply mob grinding is so worthless that even tripling the amount of XP you get per kill wouldn't really put much of a dent in your progression speed compared to FATEs and leves. Just some stuff to think about.