Of course I don’t think manga is bad, literature Is literature after all. As I said, it’s just that the interest in the material Is filtered through an appreciation of formerly consumed visual media, and even then It remains “an interest”, rather than something they actively look for. Monetary factors have also to be looked in: not every country can afford to print out Shonen Jump.
Ehhh, while it’s true that some vids nowadays have captions, this isn’t always the case. Plus, consider that a lot of content on the internet isn’t necessarily in the language Kids think in (when they don’t come from anglo-speaking countries). And, once again anecdotal experience but I have to factor that in, “digital natives” don’t seem to communicate in written form as much as we do. Blame voice messages, I guess.