I recognize the benefits of such a tool, but I sincerely hope Anet does not implement one. Ever. The convenience of pushing a button to find a group is outweighed by the harm it does to server community, WoW being a sad example of this.
I would rather deal with the small challenge of manually assembling a group (maybe with the aid of a tool like the old BC-era dungeon list) and enjoy actually making friends on my own server that I will play with again, as opposed to grouping with 4 strangers that I will never talk to or see again.
If Anet is reading this, please don't make Blizzard's mistake again.