User blog comment:Merrystar/Adopting a wikia/@comment-24431687-20150716103012/@comment-416633-20150716104235

In response to one, the wiki I just adopted had the founder inactive for almost 6 years and their founder status was not removed. You will have to submit a form using Special:Contact/general.

As for two, no one will remove your rights unless someone files a complaint about your inactivity. You will be able to adopt the wiki, but follow the same criteria as before.