For that to happen, FATEs need a HUGE xp boost. As it is right now they give much less than the Pixie tribe quests (dunno the exact numbers, but something like ~2-3% of total xp vs. ~10% for Pixie tribe quests), and they rank at the same level of patheticness as the one-and-done sidequests with their xp yield. While the sleep-casting dungeon grind (sleep even if I haven't "mastered" the dungeon), still remains, be it with roulettes or spamming the highest level, the king of the grind. Together or better(?) with PotD and that other thingy (never used those two).