Fiction does not need theory to be written. First, the fiction written, the artistic moments, and the theory, or theories, arises as a consequence of critical reading. Theory is a coherent statement of known and verified material facts, in this case, works of fiction, and the formation of theory, if it's to be interesting, comes after the appearance of a primary source. Critics and erstwhile gutter-snipers of ill reputation seek to have a theory on the same level as fiction, literature, but in terms of actual practice, theory is a secondary activity, a delayed reaction to fiction, not a simultaneous occurrence. Changing tastes and fashions have more to do with novels falling off the radar, not an absence of theory. And a philosophy without a theory, to begin with, is not a philosophy at all, only the same said more fashionable chatter. For real philosophies that get dropped into our dirty bin, it's most likely that their systems and suppositions have supplanted, discredited and sufficiently critiqued into submission, which is just the happenstance of intellectual shelf life. All bad writing comes from writers who are writing badly, even normally good writers who've undertaken bad projects. There are many tangible reasons for bad writing, not the least of which is the plain truth that the world is full of bad writers who manage to get their scams published. Modernism cannot get "less modern", I think, because the modernism seems, in itself, only a tidying up of Romantic impulses before it, as postmodernism seems only a refinement, an updating of some essentially modernist tropes and stylistics. Each age takes the conventional set of dreads and sagas and makes their contours conform to the constructed world of the current moment. What counts is the individual talent that becomes the substance worth talking about.