I disabled my Facebook account over a month ago. It was tough to do at first, but as time went by I felt much happier about being disconnected. I've enjoyed having less distractions and false reassurances. I no longer need to keep up with everyday posts from people I don't know that well or rarely see. In this time away from the site I've realized that real friends will still be your friends even if you don't have a Facebook account.
Facebook will be surpassed by another site sooner or later. Just like how Friendster, MySpace, and others were. It is just a matter of time.