How realistic? I'm guessing that depends on your skill when it comes to multiboxing or how well your current team composition handles Challenge Modes. You know, if you're running around with 5x Shadow Priests I would say that the outlook is grim , but you definitely don't need a standard Tank/DPS/Healer setup because Kruschpak just did 9/9 CM Gold with 4x Enhance Shaman and a solo player tank -- Granted the classes that were used do have a bit of self healing.