There was never any indication the questioner wanted answers. He seems OK with things as they are.
I'm sad that it's out of action. I commend David F. Jackson and all the work he's put into the project, especially his vigilance in reaching out to some very unlikely sources of airchecks and memorabilia. He's done a fantastic job.
He's also spent $50,000 of his own money to do it. That's the problem. While I like airchecks and old radio logs and radio station histories I'm not sure I like them enough to spend $50k of my own money to support such a project.
As to the question of HOW exactly to keep such a project going, I reiterate that it's time to partner with an organization that has experience doing such things. I notice that Rick Prelinger (Prelinger Library) connected his industrial films and other video artifacts with archive.org. That organization seems to have the bandwidth, the financial resources, and the volunteer help to carry on the goal of the Radio Museum.
Sometimes you can't do it all alone. Sometimes you need to hook up with someone who's already done something similar and has a track record.