confusion about manually extend process in ProSites

Under the "Manually Extend Pro Site Status" I'm having a bit of user-experience issues. Looking for the simplest way to convert a manually created site into a free site.

If I click the 'permanent' checkbox, then the user is no longer able to upgrade. If I choose to extend 3 years into the future, then if they wait a REALLY long time to upgrade, their account will expire.

Think there needs to be a third option -- simply converting to Free, no expiration, with the ability to upgrade.

Cheers.