Topic: Check that at least one admin exists
This has been suggested before, but I can't find the threads
Anyway, the idea is to stop problems like this or this. My suggestion involves 2 changes:
1. No deleting admins. Just like with bans, you need to take the person down to a moderator to be able to ban them.
2. Have a check when changing status. Count the number of administrators, and if it's 1, throw an error.