Square-Enix you didn't think this through (alt leveling)

[KisaiTenshi]

That's when you do Guildhest's... oh wait 90 minute queues for DPS.

1. Scale Fates, if nobody is around I should be able to solo it.
2. Reset Guild Hests and Side Quests when you switch class
3. Add more monsters to each hunting log bracket, or increase EXP gained by 100%.

1. No, and it already works that way, you can already solo any that do not involve killing a field boss.
2. Guildhests do not need to be reset, you can do them infinitely, just DF queue. You probably meant levequests.
3. No, there are different monster sets for each class.

If you play the entire storyline on one class, then yes you're not going to have enough EXP to level up another combat class. You will need to do dungeons or guildhests instead of FATE's.

My suggestion is that if you're leveling up a DPS class, don't bother with the DF queues because you will never, ever, be able to do it efficiently. Only DF if you're leveling a healer or a tank, because a healer can't get gold exp in most FATE's unless they have the entire non-field boss FATE to themselves. I've resorted to entering a fate with my level 50 DPS and then changing to my non-DPS class 90 seconds before the fate will end to get the exp on that role, because otherwise I'm only going to get bronze or silver entering as that role.

FATE's don't scale well for healer classes because if you're around 100 other players doing the same fate, the monster is dead before you even finish casting anything but Aero.