I’ll throw in my 2 copper, and this isn’t directed specifically at OP, but just guilds in general: when a guild recruits and sets roles, they choose who may eventually succeed the current guild master. The way it is now gives guilds the ability to choose who can have that privilege, in other words.
Although I do think the OP’s case is unfortunate, I would not change the current system, as it would effectively remove the guild’s ability to choose a successor.
EDIT: With all of that being said, I believe that you can open a support ticket for a dead guild. It may be worth a try, but there are no guarantees, especially since it would have to be an exception to policy.