Going yet ANOTHER Expansion with 'no new healer because we are STILL working on balancing the existing three' will be peak stupidity. They've handed dps and tanks new toys enough times that enough is enough. Stop dunking on healers with 'you don't need it', too. Bugger off with that. We've sat waiting and we got screwed with ShB as it is. Not only did we get the 'we're going to fix/balance you!' excuse, they GUTTED us. So take that 'you shouldn't get it until they fix you' tripe out of here.
Healers deserve to have options outside of the Same. Tired. Three. Options. JUST LIKE THE OTHER CLASSES. Tanks are all just doing the same bloody thing, why should they have 'options' if you're going to throw that kind of thinking at healers? Same with dps. You don't NEED that many options for throwing damage at a fight. Bloody hell. People who say Healers should have to KEEP WAITING even longer for a new class need to just... get locked into the job they are right now and not be allowed to change out of it for the next 2 expansions. See how much you enjoy the game.
As for what new Healer I'd like to see? NOT Geomancer. It's been injected into the AST story and ya know what? Leveling WHM I've thrown enough rocks. Lore-wise, we have someone who chatted the Elements up. And I had an entire expansion where I got sick to death of Kugane and the Far East... RIP Ala Mhigo. I'd much much rather a class that focused on a new area and a different game-play element, tyvm. Chemist would be my preference. IF we do end up heading into Garlemald in 6.0, if we start getting more tech due to the events from ShB (lookin' at you 5.1 and up...), this makes so much more sense and I really would prefer we look FORWARD and not back. It also would be more interesting game-play-wise and open up more interesting avenues for how to heal. If people want to be pithy because of naming conventions because of the CRAFTING class of Alchemist, fine. I'm SURE the devs can figure that out.
Either way, there shouldn't be any kind of question that Healers need a new job. Balancing them is the dev's job and duty. Neglecting the players because of their issues in this area is not on the table or should be something we even think is 'ok'.