A guild feature should make the system disband a guild where all it’s leadership has been inactive for xxx (90?) days. These guilds are essentially “dead” without anyone able to initiate commands.
This would force the guild’s remaining active members to remain in circulation to help guilds trying to progress and would clean up the guild search results.
All accounts would remain, so nobody loses anything and can return to the game in the future and remake the guild if they want.