I think that the major issue is Blizzard being in need (or pretending to be in need) of a Council to better understand what’s wrong in his 17 years old game.
If it’s still not clear after all this time that solo players need a proper progression path not based on WQ/daily and with an ilvl cap they will reach in one month, the game is really beyond salvation.
I agree on one thing, though: it is time to choose for real if they want to stick with grouped content only or not and stop throwing baits here and there to solo players. If it has to be a mmorpg (and it should), it’s time to fully embrace that direction by making loud and clear that solo players are not welcomed anymore.