I do think they should hire new ones.
I don't really want to be one, because I remember how much spam I used to get and if I compare with admins now, I guess it's even worst.
But maybe they should modify the questions and perhaps add new ones.
Also maybe less complicated questions, I've seen a bunch of players which had the capacity of being a good admin, but the questions made them feel incompetent for the job.(I know it sounds weird but that's how they felt)
Also maybe they should try to ask peeps in game when they see that someone is really implicated in being admin.
Sorry again if this is too long.
Perhaps some of these ideas were good, perhaps they weren't.