I'm thinking that the same logic that makes the perfect 5 man group would work for 10 mans in 'most" cases. Two palies and 8 shaman? And in WotLK this will be even more true due to totems effecting the whole raid. 10 man raiding will be level 80, and in WOtLK Shamans will have HEX for CC, even though it sounds like hex will not be spammable. Hex will have a long cooldown ( one minute or more ) with 6-8 shaman that wont be an issue. You would only need to HEX some targets. Now the only thing that will keep this make up being "perfect" will be decursing. you will need a mage or druid for some DCing. but for me.. i will swap out a shamy for one of the above only on fights where its needed.

Now if they nerf the stacking totems then this will be less effective. But if they don't? 7 healing wave, 6-8 grounding totems, all those tremor totems, and ToWs !??!! they will effect the whole raid!!! I will be leveling a druid and a warrior for fights that demand them. I have a mage and priest now. Ill be 10 boxing in WotlK 8) And maybe they will add a totem that removes curses ? ok I can only dream!