These details haven't changed:
https://ddowiki.com/page/Guild
"If there is neither any (active) Leader, Officers or designated Successor (so only "Members" are active), then there is no way for a Member to become Leader*, and so no way to add new members, promote officers, buy/change amenities, or otherwise "run" the Guild, so the Guild is likely doomed. Any responsible Leader should make sure they designate an (active!) Successor and/or Officer(s), for the sake of all members in their Guild, just in case of the unexpected - life happens."