You should perhaps remember the effect of popular media and breadth of appeal with regards to Wells and many other writers. Dickens, Verne etc. are all being continuously 'rediscovered' for new re-interpretations every couple of decades by the popular media of the time and therefore never really fall out of the public consciousness. Wells in particular was propelled to fame/notoriety by the effects of a 1930's Orson Welles radio play in the US, he had the benefit of still being alive at the time to capitalise on the effect; Since we have had various other plays and films appearing every decade or so, some even making reference to the book.
As others have observed, Wells also had a soft writing style that concentrated less on the science but on its effects, never allowing invented facts to get in the way of the story, allowing his work to appeal to a far wider range of readers than the narrow borders of science fiction normally permit.
Other, arguably superior Science Fiction authors, if less capable writers e.g. Asimov, Heinlein, Hubbard etc. have fallen out of favour with all but a small subset of die-hard science fiction fans. While they all have had some degree of at least radio coverage, if not occasional films to spur a modicum of interest, they have never had the wide appeal to roam much beyond their narrow SF clique borders.