Finally, I hate, hate, hate, hate when people toss out the 'Omg, I hate playing whack a mole, or having my screen filled up and having my job just healing people and checking out bars and decursing and blah and blah and fucking blah.'
Let's be Clear : A Priest isn't for You.
What he said.
I always end up playing clerics/priests/defenders/whatever. I usually try other classes first, then after a few weeks suddenly think 'bollocks to this for a game of soldiers' and roll a healer. Reasons being....
1) Nobody else actually ever has to make a decision, or predict what is about to happen next, or seriously assess whether people in their own group are capable of taking the beating they are getting for at least a few more seconds while I focus on that guy over there. (possible exceptions can be made for crowd control guy)
2) Player skill in other classes just doesn't (generally) have the same level of impact on outcomes.
3) The whole ball-ache of trying to find a group if you aren't a healer.
4) The even greater ball-ache of finding a healer for my group if I'm not one.
5) If you want something done properly....
6) Being able to stand at the back where I can admire all the shiny properly.
7) Mouthbreathers will more readily listen to simple instructions given by healers than by other classes. (strangely tanks also get this inherent authority - I say strangely because I can't help thinking of tanks in my group as NPC pets with really bad pathing AI)
8) Not having to get involved in all that uncivilised fightin' and killin'.
I wouldn't want healing which doesn't involve having to identify who is getting hurt, or having to squint at 67 separate effect icons stacked against each player name. You go down that road and a tank player could do it.
I don't play WoW, but this whole thread reminds me of spread-heals in daoc. Fed up of having to decide who needs healing the most? Don't worry, we'll have the spell figure it out for you. Oh... er... thanks.
Certainly the change as described would probably mean that it will take a larger number of priests to manage decursing on a raid, but requiring more of a class doesn't have a history of reducing the number of people who play it.