From talking to various people and direct observation, the blight kills them to the ground before they can produce and other diseases, including insects, take their toll on them.
You might try over on
http://www.chestnutsonline.com/forum/ They aren't hard to find in the ozarks, they are distinct once you know what they look like.
In Stamet's book Mycelium Running, there is an interesting account of the Chaga fungus being used to innoculate the American Chestnut against the blight. If you search inside the book on google books this can be read. If you read this and have more questions, post them here and PM me. I've been reading a bit about this lately and have gathered some seed that are not resistant. I can also point you to where to find wild, unresistant germplasm. All in all, its a good idea to get some seeds from the foundation mentioned above. Its worth noting they are the size of acorns and are a smaller tree so they will have a slightly different niche compared to a larger chestnut imo.