Just remove healers.

[Nadda]

Ahem* I digress enough Warrior gushing.
The point is we're at a point where we have all this utility, all this homogenization, strong tanks, and strong healers.
The game going forward is either going to have to become incredibly harder mechanically to really separate the boys from men. Like maybe Extreme just becomes the default. OR we're gonna get nerfed into oblivion next expansion. So people heavily relying on these things are gonna be in for a wake-up call.
This is why I called it Arrogant Ignorance. In my first post in this thread. People have a scrap of power and they think they own the world, but never stop to question why they have this power or where it comes from, and where it leads.
If we're gonna say fights are so easy we don't need healing which isn't true for the vast majority, do you honestly think the first gameplay change the devs will make is removing healing from their core design principles first? Remove White Mage from a Final Fantasy game? Of course they wouldn't!
It's not even an argument about what conclusion the Devs will make and what they'll go after first in order to restore balance.

Edit>> Third option I just thought of. They keep things as is. I mean there's no reason to make the game super difficult and extremely challenging for the majority of the player base. We should all be able to have fun playing what we want and we sort of have that right now. So maybe I'm wrong about it having to go either extreme... but I would say don't be surprised if you got your jobs nerfed first before they removed healers.