And here is where I am going to get a ton of people yelling at me about about not your keys not your coins, but as of now I think that a lot of people who are concerned about leaving an inheritance in BTC are the same ones using custodial services like Coinbase. And for the ones that are not, they are more then likely enough to be leaving their BTC to people who understand it enough to be able to use an X of Y multisig wallet with one of the keys not being released until after death.
The problem with the OP's solution, and with a multisig setup, is that you (effectively) must tell your (future) heirs that they are receiving an inheritance ahead of time, and that you cannot revoke the inheritance or change the amount without it being obvious to your heirs.
In some cases, a person may tell their heirs about their inheritance, but I think most of the time, the specifics are kept private.
It's important to note here, in a situation like this in many many many parts of the world you NEED to have human involvement. There has to be someone handling the estate you cannot (legally) just hand over money. That is the crux of it. I can leave Julie just about everything I want. BUT, I just can't have it automatically happen.
This really depends on state law, and the specifics of the person's estate. For example, you may be able to designate an account as
payable on death that will allow the bank to automatically transfer ownership of the account to your designated beneficiary upon your death, without the beneficiary having to wait for probate.
You will want to be sure that your assets outside of your POD accounts are sufficient to cover your debts and any tax liability, otherwise your creditors (or the tax collector) may come after those who received the POD accounts, which can be unpleasant.