Even for someone like Allen a few minutes with Quicken Willmaker would have been able to setup a trust to keep any of these things going in perpetuity.
He had cancer decades ago and it came back a few times, didn't he?
He probably convinced himself into thinking he wasn't going to die until it was too late, and things like this probably drop down to fairly low priority at that point.
Not trying to excuse him though; if he actually cared he should've been thinking about it when he was opening the museum.
(His original diagnosis with Hodgkin's Lymphoma was in 1983 according to Wikipedia. Most of the these projects in his life through 2018 were under the specter of that cancer. Even the complication of the additional non-Hodgkin's Lymphoma in 2009 still gave him possibly luckily a few years to have handled some things.)
Not that it makes it that much easier to deal with if you live that much time after a frightening diagnosis, especially because you likely can't know how much time you will actually have. But then again, none of us really know how much time we have. (How's your estate plan? Mine could use work.)
