I hope he bequeathed his stuff to the scifi museum in Seattle. It didn't look like he had kids and I sure as hell don't want fandom to start getting vulturey about it.
I wish he had been at the con, I never got to meet him. Did you?
He's apparently been trying to get someone to buy the whole collection, but no one was willing. I'm betting that the museum will get some, and the rest will be auctioned - which at least means that some of it will find good homes.