While I agree with the OP, there is a problem with changing Healer DPS. While I feel that healers shouldn't be forced to, the fact of the matter is, most of this game is single player content with a slapdash amount of actual group content. If a healer can't pump out damage fast enough in the single player story stuff...they die, it's a battle of attrition at that point. Every game where you have to do some solo thing as a healer, has the healers capable of performing DPS at least acceptably well enough to get through your content.
I don't think I will ever appreciate being pushed to DPS as, frankly it isn't my job, but the adverse it true too, sitting there and doing nothing also contributes nothing. It's a difficult way, given we have no true support to change this. While adding in more debuff abilities would be fantastic to some of us, the expectation of pushing more on a plate when we are already stuck as 80% subpar DPS and 20% actual job you signed up for, is going to turn some players off even more. Healing others should be something you enjoy doing and if you can add DPS, that's wonderful, in fact, if you can and you don't, you are wasting your time. Sure the content doesn't NEED you to add that DPS, but it's not fair for others to have to push themselves and you not. If we want a pure healer role, everything needs to be restructured so that we never have to do single player content...or else we'll always have to waste our time slapping one button over and over and staring at the screen for damage to actually come in. I want more to do, I'd love to mitigate more, or lower enemy stats, that would thrill me, but it would have to come at the expense of what we need (whether we appreciate it or not) to get through single player content.