Seems like Disney's FastPass system.

Major challenge seems to be that the lengthy AK queue times aren't caused so much by a lack of tanks/heals queued up as by Duty Finder being maxed on the number of simultaneous dungeon instances it can launch. Full parties often sit for half an hour or more waiting for a dungeon slot to open up.

A better fix might be for the infrastructure guys to do a duty finder expansion similar to what they did for the login/world servers at the game's launch.

Alternately, a couple of DF code tweaks might work; perhaps give the server a way to scale down the number of available low-demand dungeon instances in order to make room for more AK. Aurum Vale, for example, or possibly Cutter's Cry. (They aren't run nearly to the same extent each day as they're non-storyline dungeons.)