I see this as something that everyone has to think about. Infact, we are requested to choose a nominee when we open our bank accounts or take life insurance. Eventhough, many would not want to think about their demise, that is one thing that is always looming over our head. You just don't know when or where it could happen.
Eventhough, I don't have a sizable income from Cryptos at this juncture, I have a very close family member with whom I have shared my online wallet, email, PINS and so on. Infact, I have his account credentials as well. This has infact come to my aid when I lost my mobile phone once and I was able to retreive my online wallet and email from his phone.
For some though who have huge funds in their online wallet, it's exceedingly tough to trust anyone.