Wikipedia is a real life Hitchhikers Guide to the Galaxy. Its organizational structure may be a bit chaotic and perhaps not as democratic as some think it should be, but in a couple thousand years it will probably be pretty difficult to make your way around the galaxy without it.
Regardless, all nonprofit organizations become "corporate bureaucracies" after a while once they start employing people. Once people make a career out of a nonprofit they will do whatever they can to sustain it because they want to stay employed. Mother's Against Drunk Driving is a good example of a nonprofit that persisted even after its original goals were attained because the people who ran the charity needed it to continue out of self interest. At least Wikipedia is a group whose work can never truly be finished.