i was aware of this problem as i know alot of people in the tire biz, that being said, it is important for people that store there cars for long periods of time and dont drive them that much ,the tires can look new and have a hidden "dry rot".
it only make sense the warehouses i have seen they have thousands of tires,and cant possibly sell all those tires in one year let alone 3 or 4 years! this has been happening a long time! from the looks of it!