"Defunct" guilds?
A term that needs to be defined. But how?
Let's have a guess:
1) Player accounts inactive for more than N months are automatically removed from the database. (I don't know what N is, maybe 18, possibly much shorter for accounts with little activity/few hours played in total.)
2) Guilds that have less than 5 members for a certain time (hours, minutes?) are automatically disbanded.
3) Houses of guilds that were disbanded are claimed by the octarchy and can be auctioned again.
End of guess. Do the official rules significantly differ from that? If not, does anything need to be changed? Really?