Originally Posted by
Kaedan
I will have to agree with some that separating the queues would also be a viable solution. However, it's not a perfect one. There are certainly times where you'd want to search both for a fresh dungeon or in-progress one... either because you don't care or because you'd like to help out others who had a person drop, but wouldn't want to wait for that scenario only.
There exists no "extraordinary circumstance" in which my solution would punish honest players. You have to be quite deliberate to be punished by the system I suggest.