I'll admit I would totally adore 6 player dungeons. If not just for the sake of being able to run them with more friends and not feel like total crap for having to leave a friend out due to the 4 player dungeon set up currently. Weither or not it helps dps ques. It could but I don't know for sure. Just cause their really isn't a tank or healer shortage. Its just that this game along with other games tanks and healers are often friends list and guild exclusives. Personally speaking I've been in this meta for years as I'm sure other healers and tanks are as well here. I typically won't que unless I'm with a tank I know and trust. It just helps keep a low stress run for all involved. My only worry with six player parties is if by adding more dps it would mean naturally more difficult content in terms of mob health and more mechanics added, and if this alone would push more players that main tank and healers into that friends and guild lists exclusive only bracket and we would be back to square one with the dps que timers as those same tanks and healers roll as dps classes to not deal with the stress.