We "just" need a way for secret sharing to become mainstream enough that it no longer matters that it's complicated or unusual.

It'd increase security vis-à-vis burglars, but for it to work for this use case you'd need relatives who can recover Samir secrets.

If they don't care enough to find someone who can recover them then whatever is protected by the secrets is probably not that important to them.

Also true. Slightly weird instruction though :D "Here are 5 keys for 5 people, if something happens to me you'll need any 3 of those keys, then the neighbor kid will be able to help you get the password".