Lack of reward is the big stall with Legion right now as it comes down to loot at the end of the day. No one would really care about the difficulty issues if the mobs actually rewarded with items people deem valuable in 2012 which largely boils down to currency, heavy metal or alexandrite or even things like old abjurations.
SE doesn't get this though. They think Legion should just be arbitrarily hard for no reason and mobs should drop scrolls of Fire V when you finally manage to abuse Embrava and Perfect Defense. That'll surely get people to want to do this event. Right.
If every HNM killed dropped 1-3 pouches of Heavy Metal this event would begin to look reasonable for the average player who could organize a kings run and potentially win the first wave without issue. You have an item that pretty much every player on the server needs, the trial requires a huge amount and that means instant demand to join runs - PUG or not.
The items to augment new abjuration gear should also be thrown in along with more full pools (even if its just ingots, jewels and random VW tier crap) to give people actual things to spread around. 18+ people are participating after all.
Lastly why is only the HQ abjuration gear augmentable? Who thought that was reasonable? It's stupid and makes so much of the NQ gear crap since the stats aren't all that strong to begin with when compared to Abyssean era gear. Make it all augmentable so people can be compelled to repeat Legion for the augment items along with the loot.