There is no "trustworthy" museum. Any significant one has tons of stuff not on display. We could go way OT here, but PC and politics prevents much important stuff from being displayed. Plus the reasons you mentioned. Never mind budgets for preservation and space for proper display etc.

For MR stuff, I think the best we can hope for is if somebody (the Estes??) leave a trust for something, in perpetuity. In some of my other hobbies, it is only due to the wealth of significant individuals that items are displayed at all, though the Smithsonian displays a few when ~200 years old and obviously of some "national historical significance".

Bob Craddock...he sure could be a pretty crusty guy sometimes. Especially when people weren't offering enough for the (vintage) kits he was selling, LOL! Very knowledgable of course, but always seemed reticent about giving out the "rest of the story", you always knew he was holding stuff back. That is probably good in some ways, least for the bureaucratic mindset, makes you seem "indispensible". He helped me numerous times on projects, I miss the guy.