Tech, porn, and social media/lack of community are what I think the issues are. And your comment which I mostly agree with seems to contradict your first sentence. Everything you said (Gaming, endless video-on-demand, porn, social media, online dating, remote work) is enabled by technology. Ergo, tech /is/ the main culprit. Now, onto the post I originally typed:
I wonder if younger people know what it's like to go a week or two without orgasm. I don't know many teens/young adults, much less well enough to ask about sex culture. I came of age in the 2000s, when online porn was a thing, but not ubiquitous, not HD, and still taboo. I do know that deprivation of orgasm makes it that much better when it does happen, and it changes your mind in both increase of sexual drive, and for me, increase in the desire for true intimacy, rather than just an anxious need to get off. When I kick the habit, my interest in talking to women goes higher than normal, and not "simply" because I'd like sex - it's because my entire mind is changed to wanting intimacy and to meet people.
So ubiquity of porn and its normalization is a big factor in people not seeking true human contact.
I think that people are also becoming more and more shy/anxious in general, at least by my flawed observations. Between rapidly changing social cues/acceptable behavior, being constantly connected, etc., it is difficult for people to connect and disconnect appropriately.
I think about the pre-Internet era when people could maybe date or hook up, and if it didn't work, it was out of sight, out of mind. Now with social media, I see people staying connected despite falling out. Maybe out of curiosity, maybe thinking they can still be friends, but I think that the inability to have a clear head/fresh start makes things difficult.
At least in my area/life, there isn't a huge sense of community. It takes a lot of effort to find non-bar oriented things to do that has a decently high number of people attending, who are all interested in the same things, and where it's likely to find a person to date. Say what you want about religion, but church really does serve a valuable purpose when not used to direct people toward bigotry.
Gotta run to a meeting, this was a bit of a braindump, but the topic of human interaction and macro loneliness is an interesting topic, and a serious one that truly scares the shit out of me for my society and myself.