Maybe I'm just burned out from grinding to 80.. but. Hmm. I'm having my doubts about the viability of the 5v5 shaman team in high end arena now.
The reason this matters to me is because the only real reason I multibox is for the challenge and fun of competitive arena PvP. The rest (heroics, raids, BGs) is just means of doing the former. So if my team won't be viable, I should probably stop playing now.

Thing is.. WOTLK brought a lot of mechanics that turn the table in favor of non-boxed/mixed teams.

* A bunch of classes were given powerful group buffs that add high amounts of synergy to multi-class teams. This can make the damage output of a mixed team way higher than a pure shaman+healer team.

* Many classes were given heavy AoE and AoE interrupts/stuns/knockbacks. This is very bad for stacked shaman that basically only have cast-time heals that can be AoE interrupted.

* DK is basically an anti-caster class that messes us up.



In a way, I feel that a lot of the stuff put into WOTLK was designed specifically to counter multiboxing, and even more specifically, multibox shamans, to prevent us from succeeding in 5v5. I guess we'll see how it goes. I'm just.. not sure if it's worth the massive time investment to gear up in order to get ahead in the gear race for S5.