This point Jon has raised is one that most "collectors" never come to grips with until it's way, way, too late. Most would need to live to be 663 years old to finish what they have already.
I've been restoring military vehicles since my teens and over the last 30 years I have met/seen too many grey haired hoarders with massive collections of, be it, motorbikes, books, trucks, firearms or beer cans. Nothing is ever for sale and helping someone out with a hard to find part would destroy their collection.
My favorite quote from one collector is " No, I need that, I'm going to restore all these when I retire and have more time", the bloke is 87.
These individuals pass on leaving the wife, family and "good" friends to deal with rooms/yards full of junk.
My suggestions,
Make a will, your prices mean nothing so don't even try. At least some stuff will go to the right places/people.
You could sell something before you die
Don't donate your collection to a museum, they don't see the same historic value as you do. People get shitty when the visit a museum and don't see their collection in pride of place just as you walk thru the door. It's a museum with a collections policy and usually limited funds, not a storage facility for deceased collectors.
My wife is well informed in regards to my collection and it's only a matter of time before she lets the trolley jack down when I'm under the Ferret and the lot ends up on Ebay.