I will bring forth a likely case. Stack Exchange is hiring new employee, for example new Community Manager, who didn't have account on any site before. The employee start new account and get a shiny diamond. So far everything is good.
Now suppose that employee is participating here on Meta by answering, but his opinions are not accepted well by the other users and his answers get barrage of downvotes. It happened before, the most downvoted post belongs to no other than Jeff himself.
Will the auto post ban kick in, preventing the poor employee from posting further answers?
To make this somewhat constructive rather than just "Yes/No" question: assuming there is currently no protection against post ban, I think it's better to add such protection to avoid the trouble of having to lift this ban somehow.