Since the Passwords switching went back to the faces of many UN
happy people, in my opinion others ways would be "better" or more useful
for all.
Passwords auto switch first should be in a question mark (make a
poll or something) because as you can see made many people overact about a
simple thing.
In my opinion "30 days inactive will be deleted" is a
better way to handle inactive users.
after dealing with the inactive run the poll (if possible) and if
the majority will choose that its a good thing, once a year I guess will be
fine too all.