I don't understand how anyone could believe hunter numbers are declining. When have you pulled up to a WMA parking area and thought, "Gosh this really sucks.. you know what'd be great? Is if we had MORE hunters!"
R3 is a scam and the only people pushing R3 stand to make money off of it. The percentage of the American population that hunts may be declining, and I say that's a good thing. Because so is number of available acres to hunt. Why try to drum up interest in hunting to create more hunters and cram them into a decreasing amount of opportunity?
Overall, I agree that social media has been the absolute worst thing to ever happen to hunting. It draws way too much attention to it, for the wrong reasons, and is now the new sexy thing to garner attention on social media. People are motivated by likes, follows, hopes of sponsorship, and generating revenue.
I would bet good money that if all social media disappeared, we'd see a noticeable reduction in hunting pressure within a season. And I'd also bet that there would be much less negative interactions with rude hunters who think they own a public land spot because they have trail cameras and a blind there.