I think a large part of why there is so much landscape photography is that there is a definite "parroting" of what some noted photographers have done. I agree with Jorge that landscapes have been done ad nauseum. So have most of everything else. I could care less if I see another slot canyon, doorway, window, passageway, rock formations or tree(s)
In my estimation, there is very little good original work being done when one strips out what are the apparent copies of someone else's work.