What will happen??
No one will have the BTC address. Hence will them isolated?
In FIAT, people can handover money to someone.. So, i predict BTC will be disappeared gradually.
If a person with BTC and have a sudden death his/her BTC will still be in the network, unless he/she saves all information about his/her btc on notepad and can be easily access by his/her family. Like me all my online password are save on my pc.
When unexpected death happens to a btc account holder, yes all his bitcoin will still be in the network but no one will have access unless they know the correct log in details. To ensure that our wealth online will benefit our family and loved ones, it is good to keepsake our btc account information that will be available to our trusted family in case anything unwanted happens.