Not infrequently it turns out that a writer whom people have long credited with an extraordinary depth of ideas and whom they have expected to exert an extraordinary and major influence on the direction of society, displays in the end such a watered-down and minuscule version of his basic little idea that no one is even sorry that he’s succeeded in writing himself out.
It seems that Dostoyevky is taking about his own class. I'm sure he expected to be one of those writers who will have been forgotten after their deaths, but hey it's over a century years later and we're reading his works