Boring content, censorship, lameness of most users and evil hackers will make people abandon internet for something more interesting. I think internet will be left just to professional users, exactly how it started at the beginning...Look for example to what happened to second life, with big companies opening a virtual office there, and analysts forecasting a huge amount of people using SL every day. How many are left today ?!? After all, this happened years before to CB and ham radio, it will happen again and again.