I'm not a healer, but I'm pretty sure you don't want spirit everywhere.
You clearly don't understand what they did to healers with mana this x-pac then.
And with no Cho kill, no Nef kill, and no boss kills of any kind in Firelands, I don't think you're in a position to argue the necessity of spirit (or the performance of healers) at current endgame. Aside from VP purchases, quest items, and holiday items, you're going to be 2 full tiers behind when 4.3 comes out.
Yes, healer mana was at a premium in Cata Heroics and into T11 and Troll Dungeons, but with current gear it is nowhere near the strain that it was. I'm not saying it's *easy* now, but you can't act like healers are still performing under the constraints that they were in 4.0.3.
HAVING SAID THAT, I do kind of agree that the whole Spirit -> Hit for SHADOW PRIESTS seems kind of dumb. For druids and shaman it makes some sense, it prevents Blizz from having to make separate +spirit and +hit int leather and mail when only one class uses each of those armor types.
But, when we have 3 cloth classes, 2 of them not using spirit, it doesn't make much sense for a shadow priest to use spirit. Blizz already has to make the gear for 'Locks and Mages, just let SPriests use that. Moreover, it allows for the same piece of gear (or duplicates of it with better enchants/gems) to be used for either healing or DPS, which seems kind of... unfair.
Paladins can't use STR plate to heal. Warriors can't use crit to tank.