The current science suggests some deer already are or are becoming resistant to CWD. Essentially there's a race between the disease killing the vulnerable and the population becoming resistant. Seeing as how the disease will not kill off the resistant deer it is inevitable the disease will eventually lose that race. Killing off all deer indiscriminately also includes the resistant, thereby hindering nature's ability to moot the disease. As you say it is not going anywhere. It'll always be in the earth and as long as deer are susceptible to it, any deer residing on the infected earth will be infected themselves and die. Nature creating a genetically resistant deer doesn't cure CWD. It makes it moot, non infectious. It's how immune systoms work, how God made us all. Sometimes the best thing to do is nothing at all.
Here's an interesting article outling the more recent line of thinking with CWD.
New findings show some deer are resistant to Chronic Wasting Disease.
www.bowhuntingmag.com