could anyone believe that facebook would be something more than a crimson face book, or that google would dominate yahoo, or that myspace would be almost forgotten by the media, could anyone believe twitter would become Twitter, no one knows really
Getting the "freaks and the fuckers" off the site doesn't prevent the service from doing something new.
I think the idea of being connected to people one-on-one is appealing and don't think the appeal will fade.
If only if there could be more serendipity with who you are connected with... I think that is an interesting opportunity right now.