Can there be a "Wikepedia reserve army" list
where anybody that hasn't
been seen in 90 days is listed. To get back on the main list, one
simple log-in would do the trick. I would not object to seeing a lot of
"accidental" registrations cancelled completely; many of these people
have probably even forgotten that Wikipedia exists. They can always
re-register if they want.
There might also be cases of people who come to Wikipedia, register, forget
about it, then return a few months later, and completely forgot their
password, maybe even their registration name, and re-register under another
name.
Andre Engels