I'm putting my vote in for this as well.
None of the sites I build (60+) ever use an "admin" user. If someone tries it, they should be forever banned.
I'm also seeing a fair number of "administrator" and "adminadmin" users.
I've increased the block time to 60 days on those sites which only have a few legal users. Still, I'd rather just see them all go straight to the bit bucket.