I think you raise a very important point. It's all great creating a new financial system, but we have to solve all those issues that were previously fixed in the old system.
The reality is, if you hold crypto in a single signature account and you are unable to pass on your private key, all your funds are lost.
It's why I started up @eloq and I hope to develop solutions for Crypto investors in the UK, so professionals such as accountants and lawyers can help manage private keys.
That is a fabulous idea and one that will take a lot of worries and hassles away.