Absolutely. WHM will be "fine".
The only issue is that it'll be "fine" and "viable" while the other healers will be powerhouses.
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I want to joke and say PAL/WAR - what are healers.....
Ast/Sge overall, I can only really see Whm or Sch being viable is if there is just a ton of healing or a ton of mitigation required, but considering that just rarely happens, Ast and Sge could be the go to for the rdps and dps. That being said metas arent really a massive deal since you can clear any ex/savage/ultimate content with and job.
Oh no i can't believe he got you too!
I know you hate it when we say it but this is unfortunately going to be a...now wait for it... WAIT AND SEE kind of thing. And even if the most optimized groups don't run healers that doesn't mean healers have no value outside of that. Not everyone playing this game is going to be playing at that level, for those people having a healer or two will be welcome.
tbh the ast/sge meta will be more prominent due to how whm and sch gameplay will feel most of all.
with whm mp economy plummets to the ground making basically ast 5.0 and whm level 50 mp issues will now hunts him at level 90 only worse , he won't be anymore prog friendly healer(aka new player friendly) and has way more downside in progging compare to ast in terms of recovery in case of failure(especially personal failure cause they can restore their mp faster now) ,in pure healer category ast is the clear winner;
sch while have util is still one of the clunkiest and have contradictive kit that wont reward for said contradiction so while being able to do content ,its has the worst gameplay compare to sge who not only dont suffer from ghost and delays on his skiils due to fairy AI but he does not have any parts of the kit that actually lock him from using his other skills when they are used and since it was proven that sge has the same stuff sch has except niche util and he is more dps focused and actually heal people when he dps, so in the barrier healer category its sge that wins.
ast can also stack his shields with either of the barrier healers so most chances are we will see ast/sge or the niche of ast/sch as meta more even though ast has more rng.
All it takes to change the meta is a 10 potency buff to a nuke, so I'd say it's a little bit to early to tell.
I did notice though that SCH's shield potential is quite higher than SGE, so SCH might be meta in some fights if some mechanics can be cheesed with shield stacking.