Well, to be fair, you can at least afford to respec once at 60. However, finding a healer while leveling will be a more interesting process.
And people who intend to play a healer at max level content will have to get a DPS alt for farming and whatnot.
Heck even in BC playing healer was sometimes suicide-inducing. I still remember the sporeggar rep grind before they added the +heal to +damage conversion *shudders*