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.
That is a very good question, unexpected death of a bitcoin user. Then, you have to be ready and I suggest to store some things in case of these scenes. One thing is a notes of those accounts. Aside from the materials you use for your transaction you have to jot down the things to get it from, even a step by step if none of any person you want to live those know how to. The accounts can never be opened by anyone and no one of the people behind the system know about you and what just happened to you to do an action. Therefore your bitcoin will still be in case.