User blog comment:Sannse/How to Get Unblocked/@comment-27820070-20140729031130/@comment-1038387-20140729124049

See Sannse's earlier blogs, here and here.

In short, you can call for a vote on the admin(s). Everyone can vote, and if the consensus is against the admins, staff can remove the votes. the admins are not allowed to remove the discussion, remove posts on the discussion, or block people who participate. Send the link to staff at Special:Contact/general.

Note: as no one likes to lose powers, this could turn ugly. Not just that, the power vacuum can lead to new conflicts. If it's a small wiki about an obscure topic, just walk and set up a competing wiki. Show them how it's done by making a better managed wiki.