You may "lose" your parents if you don't have all of their stuff (I'm not sure what that means, but the article keeps saying it), but luckily, the odds are you won't have to live without them for more than another 20-30 years.
If that stuff outlived your parents, that means that it served its purpose well. Let somebody else buy it off ebay from an estate liquidator so it will create more happiness in the world, rather than hoarding it, which is the impulse I really suspect these situations are feeding.
I have brought up in hypotheticals to anyone who might be lumbered with them after my untimely passing the best ways to liquidate a lot of board games without getting pennies on the dollar. My only actual worry about my (physical) estate is that my heirs may get ripped off while dumping it.