The world population is too various to unite under a few portals. Even US couch-potatoes leave the three networks more and more. The web will be a lot more fine tuned to different tastes. No matter how customised a portal can become, people will get bored and find something else. I haven't seen this content quality on the net anywhere else, tough Wired is trying and improving.
People are much more interested in local news and gossip than other entertainment.