Yes I was wondering that too, even if we have low chance to get it in arenas ... currently i'm in a state where I ask myself too many question about that.
My main team is a MMMMP (my main mage is R13 + 120 days played) and i don't know if i should try BC as WMMMP or something else. But 5 sham seems to be so fun and insane and you can do both (pve / pvp)... 5 druid for farming too... so I don't know xD !