I'm not surprised in the slightest. I've been warning people in the industry about this for over a decade now. You can't just cling to an ageing audience in ways that puts off potential new fans, with an outdated business model that doesn't work any more and just expect it to keep working out of some sense that because you've been around a long time, you're entitled to it. As far as I'm concerned, Batman and Superman should be in the public domain where they're long overdue!
For years now, American comics have been making awful decisions. The readers they had wanted all these dark, gritty stories and highly serialised, interconnected stories with deep continuity, and they provided that, even though it makes them totally inaccessible to new readers. They distributed them primarily through these niche interest shops that are often grubby, dark and unfriendly to people who don't "fit in". Fans insisted on higher and higher quality, more and more detailed art, and it looks incredible, but makes a comic into this high-quality luxury item with tons of effort put in and a big team behind it, but serially released monthly comics are a thing you read quickly, they should be pulpy, they should be cheap! I only read FOUR titles when I was into American comics about 12 years ago: Ultimate X-men, Ultimate Spidey, Buffy and Runaways. To keep up with those titles was costing me too much for me to afford; way more than say, my monthly Netflix sub, which gets me tons more content. Hell, you know what I get for the price of a cup of Starbucks tea a month? The entire Shounen jump back catalogue and new releases on my phone, now THAT'S value!
Nowadays, when I buy US comics, it's usually as digital trade paperbacks. The high quality art and very serialised stories are just so much better as graphic novels. I'm happy to pay £10 for a really nice 100 page graphic novel with great art! The other weekend, I dropped about thirty quid on a few volumes of the latest run of Runaways and had a wonderful time, poring over the gorgeous pages and getting wrapped up in the stories; I'll probably read them again! Same with my previous purchase of Spider-Geddon, which was absolutely worth the £13 cost of entry! Amazing! ... But for my fix of short weekly reading, I want something cheap; designed to be snacked on and devoured quickly, so I go for things like webcomics and shounen jump. A webcomic can BE cheap because people don't have such ridiculous expectations of the quality, or treat it with such reverence. They can be made by small teams or solo creators and you always get access to all the back issues so there are no continuity problems, they're just better for how modern audiences consume content.