Why Frank Herbert's 'Dune' Still Matters : The New Yorker

A New Yorker columnist gives his take on the ongoing relevance of Dune. I find myself curious as to how he defines a "true fandom", which is what he thinks Dune lacks. Is it people in costumes? Is it conventions dedicated to it alone? Many books are extremely popular among science fiction fans that don't have those things and Dune is certainly considered among the absolute best the field has ever produced.