Any chance you have elk in that area, right up to the time you start your hunt, but they relocate around that time? Do you have your cameras out during the season? If yes, do they show the elk are still there? Some areas look great prior to the season, but the elk move to a different area around the same time each year.
If the elk are still there when you're hunting, the answer is one of three things IMO: 1) hunting pressure shuts them up, 2) there are wolves in the area and you're not aware of it, 3) your timing has been really crappy the last few years and you've been there when the elk aren't talking (although I doubt this one given how long you've been there each year).