You can still find American chestnut trees at some nurseries. The blight still exists, and infects the trees if it is prominent in the area, but the species was not entirely wiped out. There are some trees, that although not immune to the disease, have shown some resistance to it. Although they are infected, they continues to live and produce nuts! Very few still exist in the wild, but it's these few 'resistant' trees that have been utilized in hybrids and the propogation of the species.
Plant some now, and 10 years from now you might be able to find out for yourself!
I encourage everyone to support the recovery of the American chestnut. Did I mention that deer love chestnuts! They, at times, even prefer them over acorns! Plant a fruit or nut tree today, and have good hunting tomarrow.