Still, culture operates on a "hubs and authorities" basis -- there are people whose job it is to be hubs (curators, publishers, music programmers and promoters)

Still, culture operates on a "hubs and authorities" basis -- there are people whose job it is to be hubs (curators, publishers, music programmers and promoters) and people who become known for their genius ("authorities"). The interdisciplinary issue is interesting. There's probably enough of it happening to offset fragmentation of culture into specialisations.