The sad reality is that you can spend a lifetime collecting something, the but likelihood that any of your potential heirs is also interested in it, is pretty close to zero. That's true of multi-million dollar vintage computers, or your childhood stamp collection that's mostly worthless. Paul's mistake was not properly establishing a foundation & endowment to maintain this musuem, which almost certainly leaks lots of…
Anyway, guy died, his heirs preferred money to tanks, and they all got sold off. At best they are on display somewhere on the east coast behind velvet rope where no one will touch or drive them again.