A lot of people are content just to make their first runs through dungeons without Trust and without even having their gear tuned properly. A lot of the problems people encounter come down to poor communication.

Trust is cool, but going back to add on up to 60 some dungeons seems a waste of resources, unless this somehow involves refining squadrons in the process and the expansion of Grand Company activities. That's who you would have in a lot of those older dungeons anyway, as other characters were off doing other things. I can't see them going all the way back on Trusts because a lot of the starter dungeons are really easy and just better done with people.