Has anyone ever suggested 6 man dungeons before? You know 2 tanks, 2 healers, 2 dps?
6-mans were suggested really early on in launch, if not during beta, but the suggestion was 1 tank, 1 healer, 4 DD. I don't think the 2:2:2 ratio can work...you're effectively halving the tank and healer population there.
Healer would drop party 50% of the time because they didn't wanna do doors. Happened to me all the time.
As for 6 man content, I would not be opposed to it. I don't think low man content should drop better items than the 8+ player content, if anything they should add more content for larger groups.