usually when someone's estate includes a business with employees, shutting it down and selling off its assets is not what the executors do. usually they keep the company running so they can get a reasonable sale price for the whole company
The cinerama and the museum were shut down for Covid and just never came back.
They found someone to take on the Cinerama. But the living computer museum was a taller order. Which is tragic because it was an unbelievably cool place. Being able to use a Xerox Alto and an orginal Microsoft Surface (the one built into a table) was a gift. It's sad that this won't be available for others in the future.
I don't think anyone has a solid public answer about why they didn't reopen with other museums after 2020. It might be too costly, people leaving the organization, etc. to the point that the board didn't think it could reopen.