This has been resolved. You can confidently change your Infusionsoft ID without having to worry about getting locked out of your community profile. Your community profile email address will also update to your updated Infusionsoft ID email address so you will get email notifications to your new email.
Your community name will not update. This way, you don't have to worry about having a different community name on your profile if you ever decided to update your Infusionsoft ID...but if you want, you can just change it manually on your community profile.