I think its foolish to assert that a lot of the discontent with the New 52 that eventually led to DC walking it back didn't have at least a bit to do with it tossing out decades of continuity and established characters. How many people showed up at conventions and voiced their concerns about how their favorite characters were now MIA? I mean, whereswally became a hashtag that was repeated ad nauseam on Twitter. Many people asked the same things about Stephanie Brown and Cassandra Cain. You can't ignore that because it doesn't fit the narrative that continuity doesn't matter. It obviously does.
Not really. Yes, there are some big ones that are non-canon, some of the most classic stories told in this medium, but many of the non-canon ones are, for lack of a better term, the "basic" DC stories. The ones that people read when first getting into comics and when they aren't as invested yet. They're also still actually in the minority of what one would call great DC stories. For every DKR and Kingdom Come and All Star Superman and New Frontier, there's Long Halloween, the Judas Contract, Sinestro Corps War, Year One, Tower of Babel, Return of Barry Allen, Killing Joke, etc. And yes, a lot of those stories needed to be in continuity to even make sense.A few things...
1. I never said there weren't great in-continuity stories, but a lot of the big ones aren't in continuity you have to admit. And even most of the ones in continuity don't have to be, how many of the best in-continuity stories really relied on needing to be in continuity to be good? Most of them could have been told as they were without being in the main continuity or ever affecting another book.
Judas Contract was the culmination of Terra's infiltration into the Titans and her betrayal of their trust, which required, ya know, stories where she gained that trust. It also required Deathstroke's origin and motivations to be in-continuity otherwise, this old guy is just targeting these teenage heroes for no reason.
The Return of Barry Allen needed to be in continuity because it dealt with Wally struggling to live up to Barry's legacy, requiring COIE and Barry's death to be in continuity.
Sinestro Corps War was another culmination, this time of all the elements that Johns had been developing in the Green Lantern books for at least a few years at that point. It also required things like COIE, Death of Superman, and Infinite Crisis to be in continuity for at least a few of the important auxiliary members of the Sinestro Corps to be present and because the very shape of the Corps at that point had been influenced by events like the Death of Superman. And that story then also served as a building block towards the Blackest Night event, which required so much more than just Green Lantern stories to be in continuity because it revived characters who had died all throughout the DCU in stories past.
There's like dozens of other examples, but I digress
Personally, I think the "death" of comics as an industry is a bit overblown, but its probably the same reason why people also say that newspapers are dying. Last I checked, newspapers don't maintain a shared universe. Print is just not as popular as it once was, especially with TV and film being the primary means of entertainment.2. If fans were as invested in that 80+ history as you say, comics wouldn't be a dying medium.
The stories, which are the building blocks of a larger shared universe.3. Consumers come for the characters, but they stay for the stories.
Again, as I pointed out, it would be foolish to dismiss the fact that, yes, fans were discontented over the fact that DC chucked out many of their favorite characters and stories. Like, social media was abuzz with people asking for Wally West and Stephanie Brown and Cass Cain and for Tim Drake's original origin to be restored.4. Again, ditching the 80+ history wasn't the New 52's failure, being an awful universe with an awful direction and full of awful stories was New 52's failure. Pray DC learned that lesson over anything about continuity.
But those are gonna be my final thoughts on this subject.