I totally should have added a winking face or something so you got that I was joking about spirit being nerfed. I just don't see it working right now, which is why if they do it, it'll be 4.x when they bring out new talents and stuff. It's going to be a huge overhaul. I'd actually be ok with spirit for all in some form, but what's there to do with it beyond what already exists either way, which is proccing mana regen off crit heals (probably based off spirit regen for shamans) or a meditation clone? It's like a zero-sum change in effect. I can't imagine the headache of putting it all together, either. It's easy to add in some kind of meditation talent to resto/holy, but god, imagining the other talent nerfs/buffs to compensate, and redesigning spell costs and effective healing power seems pretty frustrating for a system that works for now. Plus, hell, I can't imagine how they'd shoehorn spirit into elemental besides just changing unrelenting storm, and that spec is so underrepresented in the gear table that I can't imagine how crappy spirit talents would be for it.
Luckily none of the healers actually play the same, so even if they all wear the same gear (just going up from cloth all the way to plate) it wouldn't directly impact gameplay too much, but I do like the "lol FSR" effect MP5 has.