I would say no to this.

Run with Trust = alot Slower but able to solo
Run with Actual People = Quicker and more effective, but potential for a wait que

I think this is how it should be. If trust become too effective you can just remove the party function at all. All in all Trust have to come with a major drawback to using to make party gameplay still a valid thing.

If they do allow trust to mass aoe mobs... I think XP rewarded per kill on the mobs should be reduced to compensate. Kill 50% quicker xp reduced by 50% and so on.