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What will happen, is all accounts will be temporarily deactivated and there will be an email sent out with a click back link in it.
If you do not have a valid email address in your member profile, you will not be able to access WebmasterWorld any longer.
I was just offering a suggestion to prevent the situation from getting out of hand in the future.
Regarding your comments though, I forgot to mention earlier I have a SQL Server job that runs nightly which deletes memberships that have been inactive for more than a year.