the thing about this forum is trying new things so i say give it ago mate

personally i think your problems will be loseing the point of stealth with 4 shaman following you about

as long as your shaman are ranged i think you will be fine, theres also a attack on assist button on interface options i guess this just means it will start auto attacking ie melleeing when your target comes in range so i guess you could have 4 melee shaman too.

i think you should give it ago you will know by level 20 if its right for you or not.

personally i would prob go druid over rogue, becuase that would give you the option to tank when you felt like it for instances.