As long as bad players fail to the easiest mechanics, SE will never make raidwides hurt until you need to GCD heal. It would cause people to point fingers at healers.
Think about, dps usually never get called out for wiping a pull. People usually will point fingers at the support aka tanks and healers—the ones responsible.
The problem truly lies in the devs unwilling to make support roles more than they are because they want people to see how easy it is (accessiblity), therefore dumbing down tanks and healers.
Truth is that DPS don't like responsiblity and will go back after realizing it. Notice how Sage, an easy, DPS-oriented healer caused to pull in DPS players have a huge influx the first week of launch? Last I checked, healers went back to being needed or near instant queues.
No matter how easy they make healing, people will always gravitate towards the role they like the most. And guess what's the most popular role? DPS. Personally I think SE should stop trying to lure DPS into support roles, it literally never works out. Instead, they should be making healers more exciting for the current playerbase for the role stick around.
For one, the GCD healing kit across all healers is boring. They mirror each other and are simple: ST regen, AoE regen, flat ST/AoE heal, flat ST/AoE shield.
Simply telling the devs "we want to heal more," is tonedeaf. Time and time again, the devs have shown they do not know how the players play healers. They see "they want to heal more," and they think "well they want more healing spells.
We never to be pushing for the devs to give healers more support abilities. Yes and that means giving WHM something that isn't braindead.
At the end of the day, killing the boss is the best mitigation. Healers will always be encouraged to DPS no matter what. Healers in combat are not supposed to sit there and just heal. They are there to keep you alive and enable your party to do more aka support skills (chain, cards, stun). They are more than healbot and anything less is insulting.
Push for more support in their kits.
Ex. Bravery/Faith lily skills for WHM in order to buff their magical or physical damage with Misery being the pay off for supporting your DPS.
SCH having two different fairies with dissipation on a lower CD to eat up the current fairy and bring the other one out while the CD comes back. Eos, the healer-oriented one with increases to her Embrace, and buffs whispering dawn, Fey blessing, illumination. Selene, the support-oriented fairy, that has expedient reset, AoE dps buff, stronger shields, maybe Fey wind.
Those were things that I thought quickly of, but the point is that we should be asking for more than, "can I heal more pls," and wonder why every xpac is a mess. You have to be collective and specific to get your point across. They can't read your mind and know what you want.