The basic idea that is that the public interest is poorly served by allowing people who are long dead to exercise control over property based on ideas they held

The basic idea that is that the public interest is poorly served by allowing people who are long dead to exercise control over property based on ideas they held while alive. For example, imagine I'm a successful tobacco plantation owner in 17th century Virginia, and I define my identity and my legacy as such. I create a perpetual trust and transfer ownership of my land to it; and I place restrictions on that land that it can only be used for growing tobacco. What if tobacco is no longer a profitable crop in the future, because smoking tobacco is made illegal? What if tobacco is wiped out by a pest, or can no longer be grown due to changes in climate?