Some of use just started this game this year and DO only have one 70 main (a holy paladin). My highest alt is a level 20 priest that I don't think would heal so well in Outland.

That said, it does not justify people QQing every change.

Some people are really focused, and are either able to keep playing one character without distraction or simply play less when they've accomplished goals on that character.

And, as has already been noted, not everyone has been around since launch.

Even among people who have multiple 70s, some generally identify with one particular character the most. That character may be their first 70, or their favorite class, or have some other special meaning for them. When that character's viability comes into question we get they'll worry about "my class".

Well all I can say p-diddy is that holy is better on the PTR than it is on live, so the worst that could be said is some of the other healers have been buffed more than holy paladins. On the live realms, holy paladins are already the least adaptive healers in both areas, so you shouldn't feel any less powerful if you continue to heal (in fact beacon of light will help you).

That said, if you end up being forced out of your desired healing role in either PvP or PvE, what is to stop you from playing Ret or Prot?

I only have 1 toon. Since I'm semicasual I don't have time to pimp out more than 1 toon. To me, having alt-itis means I'd have to accept having lots of mediocre toons instead of 1 really good one.

So when MY class gets the nerf bat it definitely affects my enjoyment of the game.