From my observations, Webtoon and manga don't have near as much difficulty finding new readers, so I don't believe the lack of interest in DC is about reading or about comics. I think a lot of it (though certainly not all of it), has to do with content. Thus, even if you were to make the comics more accessible I still think they would have difficulty in the marketplace, even though that would help a lot.
You hardly ever get organic and sustainable hits coming out of comics designed primarily for the Direct Market. It happens, like The Walking Dead, but that is REALLY rare, and when it does happen, there are typically only a couple of comic titles that can do that at a time out of like 500 titles, and oftentimes, those comics are the result of happy accidents or they're seemingly unexpected, like the Amanda Connor Harley Quinn series. The charts are usually topped by inorganic results, like #1 relaunches backed by speculators and propped up with variant covers, and event series, which are fleeting and seem to be yielding diminishing results.
New business models would need to be thought up for distribution for the company to be really successful, but I also think DC would need to take a sharp look at how the company approaches storytelling, and the people they hire to write, draw, and coordinate stories.
I think the best way to get kids involved is through graphic novels. They can find those at libraries and bookstores. Kids would need to be interested in those, though. From my anecdotal observations, they often gravitate toward manga and not towards superhero comics. Though that is just anecdotal, my observations also seem to correlate with some sales data I've seen.