Hm. I've read some Dickens, some Twain, and Oliver! was a very good musical (in my case it was "see the musical, learn songs from the musical in Grade 7 music class, then read the original novel").Go back 100, 150, 200 years and try to find who the most famous authors were then - almost always it is people you won't have heard of, nor will you hear about them again. Though in the case of the english language (due to the US) a few may have lingered around longer than they deserved (due to the rippling effect with 'popular culture' and the movie industry)
But why stop at 200 years? People still enjoy Shakespeare, whether in written form, performed on stage, in movie form, or adapted by various other genres (ie. the movie "Forbidden Planet" is a science fiction version of The Tempest and West Side Story is a musical adaptation of Romeo and Juliet).
Or how about Dumas? The Three Musketeers is still popular, as is The Count of Monte Cristo. I have computer games based on those books, I enjoyed the Musketeers movies (the ones with Richard Chamberlain, Oliver Reed, and Michael York), and of the two versions I've seen of The Man in the Iron Mask (also based on Dumas), I prefer the Richard Chamberlain one. As for cross-genre adaptations, Ben Bova's novel Mercury is simultaneously part of his Grand Tour series and an adaptation of The Count of Monte Cristo.