after testing a bit on Dr Boom with the tier 5 bonus and a 40arcane spec, i can confirm that it would be pretty silly :P
with a bit of latency, 760mp/1.65s is 2300mp/5... its alot :P
But so is the damage, with a flask(+70), oil(+42), tier5 4pieces (spamming AB, its almost always up), AI, BoK, MoTW, 4/5 tier 5, WoA and similar gear in the rest of the slots, we're talking of about 1300 arcane spell damage.
With CoS and Misery, we're looking at average hits of 2300. every 1.65s, with a 35% crit.
DPS of 1760... fun stuff with AP too
Spellhit not being a concern, a resto shaman would most likely be much better than an elemental one, for mana tide and the higher mana spring (and to add ideal, a shaman with 2pieces ele(+20spelldmg), 2pieces tier 4 resto(+3mp/2) and 4pieces tier 3(+25% on mana spring totem) heh.)
Even then, factoring mana tide giving back 2400mp every 300s (40mp/5), mana spring of 57.5mp/5, BoW 49mp/5, JoW of 112mp/5, spirit regen of 115mp/5, that's still a deficit of 1925mp/5 to be filled by shadow priests... ginvite for a priest who can pull that much...
VT is 5% of the priest's dps... even 4 shadow priests doing 1200dps wouldnt be enough :/
Within reach of sustainability, 3 fire mage 1 elemental shaman 1 shadow priest would be way up there in my book. I dont think the itemization is quite there to make a moonkin viable, and most of all, his 5% aura to 3.5ppl(shadowpriests arent real ppl... when it comes to crit) + his dps vs the dps of a deep fire mage ? questionnable.