When players asked for solo queue, I assumed they wanted something along the lines of a rated solo skirmish, not 6 games rotating the comp. This makes queues long, breeds toxicity, and makes it difficult for healers to climb with rating.
Also, healing uncoordinated 3s is awful, teammates tunnel, LOS you, fail to peel, fail to use defensives etc. There’s also high toxicity, flaming, etc. I once witnessed one dps getting angry at the other and tossed games on purpose, people rage quit… all of this contributes to a very unpleasant laddering experience.
As a healer, pvp was once my choice for end game content. Solo shuffle was awful, and the 2s and 3s ladder was so deflated fighting multi glads as low as 1400 cr, I quit and converted to a mythic+ player. I never looked back. I feel my actions are far more impactful than they were in SS and I’m rewarded far better for my efforts. But, I can’t be the only healer who converted and had the same sentiments?
There’s other issues too. A lot of times classes are balanced around raid/mythic+ and this doesn’t always translate well into pvp, so you’ll have broken specs/horrible imbalance. By the time these problems are addressed (if even) it’s often far too late causing many frustrated players to write off pvp for good/unsub.
It will be interesting to see what happens with rated solo battlegrounds. I think it may kill off other forms of pvp, because right now we have many modes of play splitting the already dwindling playerbase. Battlegrounds is more user-friendly, and healers have more breathing room. Damping in SS was terrible.
tl;dr to answer your question OP, it means pvp is in one of the most unhealthy states it has even been and has many dire flaws that need to be addressed if it ever wants to have an active, healthy playerbase again.