That's a really funny joke, YP.
Pouring out an Ether for my WHM comrades.
"Just wait for6.016.056.086.1"
https://i.imgur.com/2IuhYWU.png
What we ultimately need is a radical shift in design philosophy. They need to learn to respect how we as a playerbase respond to the relationship between GCD actions and the value we place on DPS, then rework how healers perform fundamentally with that relationship in mind. Until that day happens--if it happens--we can only ever hope for marginal improvements or smoothening out of certain aspects.
I won't say it will never happen or it can't happen, but I also won't say that it will happen either. Every expansion is years apart, and there's a lot of time between then where mentalities can change--new blood can join the design team, or an overall shift in job design philosophy can occur. And that's something that does happen in other games as well, so it's not an unrealistic possibility. It's really just about chance, and hoping that maybe one day there will be an eye-opening experience for the job design team.
I'll say it right now - if you want healers to be more relevant outside of raid content, 7.0 is pretty much the earliest hope for changes in that direction. SE simply doesn't do major battle system changes outside of expac launches. (And on this particular point I'm still not optimistic, it's opposite of their long-running current direction).
Now if you're hoping for help with the weakest healers in a raid setting, that can reasonably be hoped for by 6.2, maybe 6.1. But SE also sometimes leaves underperforming jobs alone for a long time, and since they don't share their reasoning with us it's difficult to discern why this may be and when it will or won't happen.
on one hand sure, aside from the usual x.3 "this class is going to get a massive overhaul in one direction or other" that we've seen with MCH, NIN, MNK, MCH, SMN, and MCH
edit: and on a semi-related note, usually the BLU updates give a sneak peek into whatever combat mechanics the devs are toying around with for skills going forward (ShB BLU was really big on skills that toggle into other skills conditionally or as a soft-combo, for example)
None of those patches will matter, because healers require a fundamental content and job design rework, not number tweaking.
And increasing the challenge of incoming damage or adding more involved damage rotations is something that YP has explicitly ruled out, so it's not like it's something that is "wait a little longer" as opposed to "never gonna happen."