Gotta disagree. Tilly is one perlmonks' most prolific posters, yet he disappears from time to time. As I understand it, his work sometimes requires that he refrain from posting on public forums, so there are long periods of silence. Had we enforced a "three months of silence" rule, Tilly would have been nuked and we would have lost one of perlmonks' most valuable resources. Furthermore, if a user is nuked and the namespace freed, how do we label the previous name-user's nodes in order to distinguish new-Tilly from old-Tilly?