If the original authors stop maintaining an OSS project, and you are one of only a very few users, you have two options: do the work yourself, or watch it die. If you are unwilling to do the work yourself, then that's a signal it isn't important enough for anyone else to do the work either.

Why should a wiki be any different?

Not the commenter but in this instance it seems like if you want something you need to either be able make/maintain it or fund someone who will, no?