If DC can find the distribution channels to reach a wider audience, and produces content those people want to read, and markets it properly so people know to look, it won't matter if certain people want to share the pie or not. Their bitching and whining didn't stop Captain Marvel or Wonder Woman or Black Panther from being huge hits in cinema, and it wouldn't stop the comics from being successful either. But the trick is finding the right distribution, the right products, and the right marketing.
Regarding a subscription service....something along these lines could work. We don't really have much to base its success on outside of Marvel Unlimited and Comixology and some loose parallels with Netflix and other streaming services. I'd think a multi-tier approach; let people buy the individual issues they want for 99 cents with no subscription, and offer a couple subscription plans where you pay X amount and get Y books; more expensive plans offer more titles. For the higher tier subscription plans maybe add in a few benefits like discounts on trade pre-orders, early access, exclusive behind the scenes content, or something. And of course, subs would still be able to buy more comics for 99 cents too. Nickle and dime the customers to death, with enough value included that they thank you for it. And since digital resources are relatively cheap, it's not necessarily a bad business call, though this sort of thing is outside my experience.
But you'd have to structure the whole thing right. I don't know if you could take the comics as they are now, with their monthly release schedule, endless renumberings, limited target audience, and convoluted continuity, and get the subs you'd need. That would largely only pull in established floppy readers willing to make the switch to digital, and we've seen that they resist doing that. No, you'd need stuff that appeals to other audiences; kid focused stuff like Superman Smashes the Klan and more adult fare like Last God. In the same way that Netflix has shows for kids, for families, and for adults, this would need the same kind of thing, with each title labeled and cataloged properly so the right audiences can find it.
You'd have to change the release schedule (has to be weekly, in my mind), the numbering (a "seasons" structure, like tv shows, seems viable; Superman season 1, issues 1-26). You'd have to change the creative approach to fit the new factors.
The entire process would have to change. But I feel like it could work, if it were handled right. Basically Ink/Zoom, Black Label, those YA bookstore OGN's, and I suppose some main continuity type stuff all rolled into one digital subscription service.
I'd probably want the whole thing linked to the DCU app in some way; that way you've got more than just comics to offer, and the people who sub for the shows and cartoons will inevitably find themselves reading the comics between new episodes, and it's a small jump from there to buying.