I really hope they scrap / rework current disc. In the last 2-3 years I haven't played with an amazing disc priest, some were tolerable but vast majority of them do extremely poor healing, however raiding guilds constantly insist on recruiting disc priests / forcing other healers to reroll or respec disc even though 99% of population has no clue how to play it. Outside of world top 100 guilds it's basically impossible to find a person who is skilled at disc. I've seen the worst grey parsing discs that basically all they know is spam pw:s and smite randomly and pop barrier when healing officer calls for it, and then the whole team is expected to compensate for lack of healing, I've seen endless wipes when a person died with no fault of theirs, from expected damage, after using their class defensives, healthstone, health pot, etc. and they're still told it was their fault meanwhile healers are untouchable holy cows.
A lot of guilds are copying top streamers / world race guilds so I've seen complete phasing out of resto druids from raiding despite it's actually a fairly easy class and could help pad the hps many raid teams lack.
Seriously, our disc priest in mythic EP:
Different guild, disc priest in Nyalotha:
I wish this spec didn't exist, because raid leaders / gms obsess about getting one and this is the most common result. Bet Uldir logs expired by now but my guild went through 4 or so disc priest trials, none of them could heal.
And don't even let me started on m+ where the spec is already sub optimal in comparison to paladin, druid or monk, and then it's also harder to play and played badly. Last week I had the misfortune of pugging weekly m+15 with a group that invited a disc priest, deaths from bursting were numerous. Doesn't help that the spec is fairly ill equipped to deal with bursting or grievous, but then we also have people who tbh should just play holy because it would be so much easier for them.
And no, don't wanna even imagine how it is at lower levels of content where skill of players is 10x lower too.
In comparison to other classes that are highly sought after atm in raiding (brewmasters, holy paladins, fire mages, bm hunters, destro locks, havoc dhs, arms warrs) disc is the only one that is hard to perform well on even in proper gear.
Yes, Blizzard should do something, even if that means reverting the spec to being braindead easy at a price of lower hps ceiling "when played well", if that means top guilds will stop using them, so be it, will be for the health of the rest 99% of the playerbase.
Also, Blizzard, please stop designing raid encounters around hps requiring 3 healers but cooldowns / dispels requiring 4 or 5. And don't make any mythic Azshara ever again where there's nothing to heal but absorbs / damage reductions are OP. Let healers heal and not be just cooldown bots.