In the early 2000s, there were a lot of old, nearly collapsed barns and sheds, as well as long-abandoned mills. Since then many old wooden mills have burned down, but anything reasonably solid was renovated and converted. Many old mills have been turned into senior housing or a business or shopping venue. Most barns have been renovated. They are still barns, just not falling down.
It would seem that the value of a barn to too important to let it collapse. We have barns in great condition that date back to the early 1700s.