Not gonna debate whether this is right or not. I just have a mere suggestion, feel free to hear it or not. Based on what i read and my understanding, clan that are failed the activity check will go straight to unofficial and some people might think that as a disgrace or something like that. I'd believe giving an option whether they want to become unofficial or straight to dead clan within time period would do the job. Since when they failed they are not automatically remove but given some time, so why not proposed the option in that period... If there is no clear answer within the period, take a safe bet and make it unofficial. (Would be much better than when you come back and suddenly everything is gone)