So I am curious, since there is every possibility that this users have handed down their account details to family members or others to use the forum for whatever activity they wished before they passed on; If a post should ever be made from that account, would it get tagged, as probably a hack on the account or account sale(allowed but frowned upon).
I guess that's an interesting question, though I doubt that's going to happen in Bruno's case. Last year he sold one or more of his accounts to, I think, suchmoon. I'm wondering if suchmoon (or whoever took control of the Gleb Gamow account) still has access to it or not, and I can't remember the outcome of that situation other than Bruno got slammed for doing what he did.
People die all the time, and accounts all over the internet get abandoned daily. It's not a new situation, nor do I think it's an issue that's of particular concern to bitcointalk. We've already got a problem with account sales, and you never even know who's really writing when you see a member post something. Someone hacking a deceased member's account certainly could happen, the same way an inactive account (from a member who isn't dead) could get hacked.
Anyway, I wouldn't worry about Bruno's accounts becoming active again. Obviously if one of them did start posting, you'd know it wasn't the original owner.