Could we do without healing Potency?

[Dzian]

There is also the problem that for those healers that want to try to push the limits of their job suddenly that optimization work would become an rng farm (more than now), "oh fuck the rng aoe happened 3 times in 15s F for the parse" would be very common and frustrating (letting alone that people eating aoes and such is also another form of random damage spikes and its not something most of the healers are fan of), and that the healer problems would persist at lower levels and in normal mode which dont push healer gameplay that much (and looking how the devs design things, won't do ever) so we're left with the boring dps rotation.

From a design perpective and given the official stance on parsers, any content changes that would mess up a parse are a none issue. the devs wouldnt even consider parsers in any potential design changes.
As for the green DPS i can't see them ever going down that path because there's a pretty large crowd of people who play healers to heal. if they want to dps they'll play dps jobs... making healer dps more mandatory would effectively alienate a significant chunk of the playerbase.