For sure, population will decline. However, overall, in a few years, the hunting will be good and the deer that survive the disease will be immune to it. Every now and then, Ma Nature has to cleanse things.
I was hunting in South Dakota a few years ago following an EHD outbreak. I found four w.t. carcasses(sp) that I scored at over 130 and was shown two that would top 150. The landowner had no idea he had bucks like that on his ranch.