Just when Blizzard added the Death Knight hero class to address the tank shortage, it seems like a healer shortage is another problem that might have to be addressed. I say might because these are all observations from some people as the Wrath of the Lich King expansion approaches.
Dizeh of the Northrend-US server tells of having a healer shortage within their guild since they want to be something else. Cipher from the same server says that he has a hard time finding healers for instances. It seems that the culprit is a combination of different things.
One reason I can think of is the one mentioned above, players wanting to be something else. With the introduction of the Death Knight class and the cool stuff that many of the dps classes are getting, it seems like a lot of players want to try them out. Right now in fact, some of my very own friends who play tanks as doing some last minute leveling before the expansion comes out and the popular choices are mage and warlock but there are some rogues and hunters as well. Only a few of my friends who have dps or tanks as their mains are leveling healers.
Another reason I can think of the removal of downranking and its effect on healer efficiency. A lot of healers have relied on downranking to be more efficient and stay effective in longer fights. With its removal, the fear of going OOM and possibly causing wipes because of it has scared away a lot of players. Not being able to heal properly makes a job that some already find boring annoying as well.
Personally, I liked my relatively short stint healing as a holy paladin so much that I've decided to level a druid and try healing as a Tree in the expansion. It was part of my backup plan to have another healing class in case holy paladins weren't going to be great in the expansion. Of course, there's nothing wrong with having two healer toons if both turn out to be great. So if there will indeed be a healer shortage, my friends can count on me if they need one.
What do you think? Do you see a healer shortage looming in your server?