Board Thread:General Discussion/@comment-35616940-20190304124310/@comment-34804319-20190304133059

Sebastian, if there are no current editors on a wiki, and the admins/bureaucrats have been inactive for more than 60 days, you must file an adoption request (as I'm sure you know already). You can also read the help page for more information about the process.

Since wiki's are generally only closed by request of the founder, if he/she is inactive it is very unlikely to be closed otherwise. You can always wait and see, or, however they will most likely also state that adopting the wiki is the path to take.