What will you write in this letter? Some hints to remind yourself the password for your wallet? What will happen if your memory gets wiped 100% and there's nothing to remind yourself of left in there? You'd have to either write down the wallet passphrase or mnemonic phrases but this will allow your children to get the money without waking you. You see, the problem is when you're dead you don't need money and everything is out of your hands. They can wake you up or not, they can steal your coins or not, don't worry about the things you'll never be able to control.
If you leave control of the money to an AI you risk it being hacked. If you live it to a friend, you risk him taking it all without having to wake you up later. If you hide it you risk not remembering where it was, and so on.
If there is a technology that can make us hibernate, there will be technology for us to use to recall memories. Maybe it will become a kind of memory bank for the memories of everyone who is hibernated. Once my memory is fully recovered, I can do what I want.
As long as my children and grandchildren can keep what I have told them, then there is nothing to worry about, especially since we can leave another legacy that they can use.
Could be possible but into some certain extreme extent on setting up all of it according to your likes or preference but with due technology enhancement and development then we could possibly able to do so but just still some sort of sci-fi scenario that's why lets not talk about that.
When you are really that minding about passing those coins for inheritance in case you die then it isn't bad to make or put it up into some will incase you pass away plus having
those set of instructions on how to access it out.
It hasn't happened yet and yes, we can only speculate and imagine what the future might hold and how long we can live. But there is a possibility that such technology will occur in human life and we may not be able to see it.
If we leave the coin as an inheritance, we can teach them how to use it properly and as long as we are alive, they will surely learn a valuable lesson from us. So if we are dead, they will have no trouble because we have taught them a lot of lessons and they can also look for lessons on the internet.