I am sorry to learn about your situation. You’ve articulated something that many people in our community quietly think about but rarely give voice to: what happens to the things we’ve poured decades of passion, care, and money into—especially when those things hold meaning for us but may feel like a burden to our loved ones.
I will speak to the steps I’ve taken in case my spouse end up disposing my system. Took me a while but knowing my wife has no interest in my main system, I’ve put together a spreadsheet outlining all of my gear, purchase price and media collection (CLZ Music software) that would help her dispose off my treasured possessions into the hands of people or places that will fetch a decent value.
A spreadsheet or thinning some of your gear now is all about how to leave traces of possessions you’ve enjoyed and treasured. Your dog will be loved by your wife; your music legacy can be loved by friends, younger enthusiasts, or even institutions. What matters is that you’ve thought about it—and that is already a great kindness to those you love.
Take care and enjoy music!