Yeah, but inheritance law has changed a lot over the centuries: before the French revolution only the first child (possibly son, I don't recall right now) could inherit, then the revolutionary government made a big deal of splitting properties equally among siblings in order to break up large estates. After WWII most Western countries had very punishing inheritance taxes, and that's been dialed back in the 70s. Some economists (Piketty and co) make a big deal of bringing back high inheritance taxes and using them to finance a universal basic capital to be disbursed at a young age.

In a sense, due to the deflationary nature of most crypto, dying without telling anyone what the key to your wallet is, is equivalent to redistributing all your funds to everyone in a way that is proportional to the amount everybody already owns. So it's kinda regressive, which seems to align well with the current crypto political climate...

Then again maybe this addresses the inheritance tax issue. Instead of debating how much money goes to heirs vs the state, folks net worth could just "evaporate" on death, thereby slightly (presumably) reducing the supply of whatever currency was held at the time of death.