The idea is great but I don't think that is necessary though, I think the owner himself needs to be aware of his status and have some kind of protection/ backup for his Bitcoin. That should and must be the right thing to do with everything especially with this field which involves crypto where you can lose all your assets because you lose your private key and have nothing to backup.
So it's like backing things up, the owner needs to point out the inheritance himself, let the wallets do the more important works.
It is necessary if you want to "fix the world".
We have to assume that some people will never tell anyone that they own Bitcoins and the coins will become lost the moment their owners die. This means that the number of coins in circulation will continue to decreas to the point when there's maybe 10% of the innitial 21 million left. I wouldn't worry about it too much though, unless you care so much about future generations and their access to Bitcoin. IMO, they will find a way or create their own, better version of BTC. Nothing lasts forever.