I don't believe that people will stop using social networks, it may just be in a different form than it is now. People have the need to stay connected and see what other people are doing with their lives, and share pictures or information with others. And the internet with its social networks has been a great way to do so. And that is not going to change in the near future. If you come up with something innovative and there's a need for it, why not try it? If you never do it you can never win.