Board Thread:Wiki General Discussion/@comment-14072535-20131011060528/@comment-5428123-20131011073547

I believe they released an admin notice mentioning that several people were losing access to their accounts after upgrading to iOS 7. This forced password move is probably their way of damage control to prevent more complaints in the future once more people get around to updating their iOS. This way, even if you lose your account while updating, you can still get it back.

Personally, setting a password isn't a big deal to me. I simply just take a screen shot of the password, and email it to myself.