Just my thoughts (And Hi! First Post!

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I don't just think this is the best makeup to max the threat of your prot pally, I think it's the best possible raid setup period, assuming the fight only requires 2 genuine tanks (and there's no requirement for 1 of them to be a warrior). It's also the best if you only require 1 tank, because your feral druid can easily DPS.
Prot Pally
Affliction Warlock
Resto Druid
Resto/Elemental Shammy
Shockadin (healer)
Ret Pally
Enh Shammy
Warrior (Blood Frenzy)
Warrior Fury
Rogue
Elemental Shammy
Destro Lock
Destro Lock
Mage
Spriest
Resto/Enhance Shammy
Feral Druid
BM Hunter
BM Hunter
Survival Hunter
Healer
Healer
Healer
Healer
Healer
I don't think this group is too far out of the realms of possibility.
The holy pally loses very little by speccing Shockadin. 1 Affliction Warlock is basically a requirement now anyway with Malediction affecting the single curse that's been rolled into 1. He isn't going to complain about using his Imp.
Your second tank is the feral druid who in turn receives the biggest buff he can get (Agility totem) and in turn buffs the hunters with Leader Of The Pack.
You've got anywhere from 7-9 healers depending on what you ask the shamans to spec that day.
Really the only glaring problem I can see with this raid makeup is that very few guilds have access to that many Shamans.
Also, It's not possible for the shockadin to also have improved Devotion Aura so you're missing out there, but i think it's a good trade to get sanc aura instead.
The biggest problem with these kind of ideal groups though is that there is very little margin for non-attendance. If even 1 person who plays that class isn't present you tend to end up back with a generic "tank group" which doesn't help you at all.
Still, it's nice to dream eh?