Fertility rates going down, divorce rates going up, and young people finding it harder to navigate dating and relationships. To the latter point, soon most new relationships will start through dating apps, and these have their share of problems too. These are some of the things that I think make finding companionship and building families harder.
on the other hands, dating apps have made it easier than ever to find compatible partners, and technology means that even if your parents divorce there's no problem keep in touch with either parent which applies just as well to extended family/friends. It's a lot easier to keep in touch with friends after graduation than it was when your only option was often "pen pals". It's not all doom and gloom. In many ways we're more connected than we've ever been and we're just in an awkward state where we're adapting to all the changes.