Having the ability to reorder the Email Types would definitely be very useful for all marketers!
The main reason being: if you have many different email types on the subscription page, there's no easy way for a user to select the exact email type to unsubscribe from. It's much easier for them to scroll down and unsub from everything which we want to avoid.
A good solution would be to display the email type of the email that they clicked from at the top, and then have all other types below that one so that the page will vary depending on which email type they clicked on.
If anyone has suggestions on workarounds right now, I'd love to hear them.