You want them, they want you?
Are people getting stupider? Anecdotal evidence (i.e. the only kind I have) suggests that yes, they are. But I don’t think social media is the cause as much as it is an effect.
Those authors you admire found their style by writing hundreds upon hundreds of thousands of words no one will ever read.
If you were my friend it wouldn’t take you 18 hours to respond to my texts. If you were my friend you’d answer when I called, or at least call back…at all.