Well I guess that people get blocked by good reasons and along with policies, and they would stay blocked. No need to send anything to anyone, they stay blocked, everything's normal.
If someone want to have an extreme exception and want to show a good reason to be extremely exeptionaly handled s/he can choose this extremely exceptional way to have this _infinite_ block nevertheless removed. The whole process is exceptional and happens by the choice of the given person, I do not see any urge or need to use it. I'm sure that if the block was not justified it can be removed by normal process, right?
g