More dots does not necessarily equal more dps. Two dots of potency 20 is less dps than one dot of potency 40, due to losing two gcds for it. We're not asking for two dots with the same potency as the dot we have now.
Also, when we say we want more dps buttons, that doesn't mean another button that does the same thing except with a different cost/potency. There can be dps buttons that do other things. I consider Presence of Mind to be a dps button, because (assuming that healing is going well enough that you don't need to use it for healing. Obviously healing gets priority) you can use it to get more dps in. Bane was a dps button and it did something different to all our other buttons (spreading dots provided a tool to get more use out of dots on an enemy that was about to die, for instance). Personally, I'm not looking for a rotation like, say, the one on dancer. I don't want more than one button that essentially does the same thing, but which have to be pressed in a particular order (except that I would like more DoTs, because keeping an eye on the duration of both was an element of complexity that I miss). I want more flexibility in my dps kit, not more power. I also want my job to require more decision making of me. Deciding to use presence of mind for DPS means it isn't available for healing. Deciding to use aetherflow stacks for energy drain means that you won't have that stack for an emergency lustrate. Those kinds of dps skills made the job more interesting to me, and pushed the skill ceiling higher.
Genuine question: why do you think it would be a bad thing for healers to have better dps? People who didn't want to use it could just ignore it, while people who did want to use it would be happy. Is it just because you're worried that WHM will become the lesser healer again? (It was in a sorry state before. This is the first xpac I've considered maining it in). If that is your main concern, can we premise any following discussion on the assumption that whatever changes are made, WHM should still have the best dps numbers of any healer, by a decent margin? I'm more than happy for them to keep that, and if we agree on that, perhaps we can better discuss what form the dps should take.