The dynamics will change. Their priorities will change. It's something that I have been experiencing for the last few years (I'm in my mid-30s now). But it really isn't the end of the world. I always refer back to one of my mom's best friends, who was single throughout the whole time my mom brought up me and my sister. While my sister and I were young, they had a lot less contact than before. And when me and my sister got into our teen years, that changed again. That's why I believe good friendships are going to "survive" this, and yes, right now I am not hanging out on the weekends with some of my friends as much as I used to. But I love them, I respect the life they want for themselves and that fulfills them, because they also respect mine, and based on my mom's experience I also know that at one point these things can change again. That's just the way life works. Things don't stand still, but if there really is good core friendship, it won't make a difference in the long run.