I think he had a lot of irons in the fire that may never bare fruit now. He bought Howard Hughes’s ME 262 from a museum some years back with the intention of a total restoration including the original engines. That would have made it the only flight worthy 262 with original engines in existance.
His company - Vulcan - will carry on with interesting research. I have heard about some of the projects that they are working on, and they are things that will change how we look at our planet. I think one project was something like figuring out how to actually count, not estimate, the number of fish in the oceans and where they are. Pretty heady stuff.