Honestly, Lucid is one of the things they COULD remove. Depending on how you play, you either use it on CD, or use it after you're below some MP threshold (70% or 80%). This means you never "save" it for an emergency, like death or having to Raise. Meaning if you KO and get raised just after you used it, you don't have it to use. It's not a reliable recovery tool since healers (not AST) are MP negative (6.0 WHM says "hai!") and so have to keep using it. It's like Astrodyne. AST isn't holding onto it for recovery situations. Not being optimal, anyway.
The way it's used, Lucid is boring and should honestly be removed and just increase healer natural MP regen to have the same amount of overall MP generation per unit time. The encounters and kits are based around that much MP regen, so it makes no sense to waste a button on it that brings nothing to the table. At one time, Shroud of Saints lowered threat, so it was a secondary tool in that sense, but now it doesn't.
This makes Lucid the highest healer role action to put on the chopping block - at least Repose has use in Deep Dungeons and stuff. Lucid, if healer MP pools were boosted to account for it being removed, brings nothing to the table worth keeping it. Surecast is also heavily used by high end players in Savages, and some Extremes, and some Ultimates are designed to incorporate it to be used at some points. That would be a far more damaging change than removing Lucid rebalancing MP regen.
Up until this point, what you say is very similar to what I suggest all the time...I know, after this point it diverges, but it makes me wonder if the gulf is not more narrow than if often seems in terms of potential compromises...
The crazy thing is, healers have 4-6 damage buttons NOW. We just don't use them well.