Shurrikhan - Thing is, we always have this at any given time anyway. SCH/AST has been meta since SB, if not late HW. SCH/SGE has had a little light in EW, but it's still pretty much SCH/AST. Yet ironically, WHM is the most played healer and AST the least.
Again as I said above: What we have now IS the compromise position. It's the compromise between "healers only heal" and "healers are full on Green DPS". Acting like this isn't the compromise doesn't change the fact it is the compromise.
Hence why my proposal is a better compromise, as it means the people that want to be busy have access to being more busy and the people that don't want that have access to a healing Job that doesn't do that. What you're saying is all four healer Jobs must be the same in having a high skill ceiling and medium skill floor, but there's no reason they do. Just as other roles have different Jobs that are different - Tanks have WAR as "the easy one with a low skill ceiling" for people that want that while having three flavors of "something more complex" and players pick the one they want.
I don't see why healers can't work this same way. I've seen a lot of people say they don't want it to or that's not a solution, but not really a why it's not other than it would upset some people - as if making all the healers more complex wouldn't? NOTHING is not going to upset SOME people.
Me personally, I would welcome the diversity. Hop on AST and throw buffs left and right. Hop on SGE for some RDM-lite action. Hop on SCH if I want to play with DoTs and interactions. Hop on WHM if I want to turn my brain off and Glare. I think diversity is the solution, not replacing one form of homogenization with another...
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EDIT: Oh, you say there's no avoiding damage rotations - but there is right now. No healer has a damage rotation. All four are hitting one button over and over again, rarely hitting something else. That's not really a "rotation" in any realistic sense of the term "rotation" (only in the most broad definition and not in a sense people think of in video games). It's gameplay offered by the game right now satisfying the people who find that appealing. So it exists right now!
And you mention Clemency or a healing summon as support and that people like support when it makes sense and works - that's the thing, healer DAMAGE is not support. So that would the false equivalency. No one's really complaining if a healer gets another mitigation or buff (support) ability.