Aug 11th 2008 12:26PM ^^ This.
I was in an Illidan-killing guild, burned out, retired from raiding. Eight months later, I'm back with a much more casual guild that is (undergeared and) working on Archi. Watching the priests pot up or pull out their shadowfiends when he's still at 90% is frightening.
Yes, farming for health/mana pots sucks. But at the same time, being able to chain-chug them is incredibly helpful for people who don't have the gear or the (mana-conservation) skills to survive. I'm sure Bliz will tune fights around the lack of potting, but I'm concerned that it's going to be one more obstacle for my casual (& sometimes crappy) guild to have to get past.