I have shared my experience before of helping my father inherit his father's 39,000 books. A collection that occupied three apartments and was worth hundreds of thousands even back then.
I hate books now. Hate. Please don't burden your successors with thousands of objects that are important to you and not them.
John Hodgman says the difference between hoarding and collecting is a display case.
A display case limits the number of objects that can be in someone's collection at a time. Good collectors get to a reasonable collection size and then operate on something like a one in, one out policy.
Sorry you had to go through that huge burden. I had a hoarding grandparent (not anything to that extent). It was painful to dispose of as the belongings were filled with mold and everyone got sick while throwing it away.
I hate books now. Hate. Please don't burden your successors with thousands of objects that are important to you and not them.