Is writing being "normalised"?

This question came to mind when I was reading War and Peace. One of my favourite novels of all time, and probably the greatest literary work of all time, I realised that Tolstoy's masterpiece would never have been published today. Not a chance. No literary agent would be interested in anything that stretches to 1000+ pages, on paper the work lacks mass market appeal and, on an even more basic level, Tolstoy would have been utterly unable to squash the plot of his novel into the standard one p...