Firstly, it made no mention of showing off to potential mates, to my reading. But have no fear, regardless of scarcity people will have ways to signal fitness to find mates and build hierarchies out of it, we're very good at that. It might come down to fashion choices, leisure activity choices, really anything.

Secondly, every example of how this person connects with others is to do with technology and career advancement. He wasn't asking knowledgable friends for advice, he was asking questions to strangers about linux on IRC. He doesn't talk about social groups or sports clubs, he was talking about communities of practice and his professional work. He values learning only for career advancement.

Those ways of building relationships might disappear, but old ladies will still get together to crochet and natter. Middle aged men will still make and drink beer together, or practice woodworking skills. Younger guys and gals will still form sports teams. And people will still learn for the love of learning.

You know, things which already happen away from the screen. Ordinary, everyday human stuff.

tl;dr - touch grass, the article says a lot more about the author's life than our future prospects as humans.