It's similar thing with Bitcoin and private keys or seed words, and I don't think we need to have bitcoin-babysitters for that.
Even if you had bunch of gold plates hidden in undisclosed secret location and you never tell anyone about that, it is lost for your family forever when you die.
If you want to leave hidden treasure to your family you live them map with instructions how to find it, same thing applies for bitcoin.
Now I want to see a movie that plays in a distant, far post-apocalyptic future, where a lot of technology was destroyed, governments and banks don't exist anymore, however hobbyist-run nodes on smartphones and laptops with 128TB SSDs are still up and running and connected through an off-grid mesh network. They are just lying around in the destruction and some still run.
Then in the rubble, underneath a destroyed building, someone finds these two huge golden plates (insert some reference to Moses). After getting excited about its value and sudden realization that he can't easily trade or transact with this gold and there is no banks to sell it to, he realizes there are seed words to hundreds of BTC on them...