Well how far ahead is anybody thinking? I'm thinking anywhere from 50-100 years. The world is going to COMPLETELY change by then, based off of the kind of power China will become, and its ties to other powers; their influence IS going to come to matter in Western Civilization like it never has, as well as parts of Europe. A lot more suppression will exist in everyday life. Yes, there is ALWAYS mainstream, but the mainstream will not be easy to avoid. Or in the other sense, it will be easy to avoid, but there will be nothing else to catch up with.
For instance, China has already banned several music websites ( see
http://www.scaruffi.com/boycott.html for an example [and no, I don't read Scaruffi, but a friend link it to me.] ). It will not be as 'easy' to find the 'underground' scene as many people seem to think. It will result in impersonal, calculated suffocation.