Proposed Law Change for Email Unsubscribe

I have the same thought each year as I trudge through my yearly Inbox Enema: 

There oughta be a better law^† for unsubscribing, and that law should look as follows.

• All email messages sent from a subscription service shall include a single-click opt-out for unsubscribing^†
• The opt-out shall be a clickable link in the header and footer of the message.
• The clickable link shall be attached to and presented by one of two methods:
  • The (hypertext) word “UNSUBSCRIBE,” or
  • An image/button that clearly presents the word “UNSUBSCRIBE.”

• Upon unsubscription, the service shall send a single message confirming that unsubscription is complete.

To further define “single-click:”

• When clicked, the link shall directly unsubscribe them from all communications.
• The user shall not be required to further login (provide credentials) or choose from a selection of opt-in/out preferences.

You may:

• Present a page that indicates they have been unsubscribed.
• On that page, include links to re-subscribe.
• On that page, present a selection of opt-in/out preferences.
• In the confirmation message, present any marketing information, resubscribe links, or opt-in/out preference links.
• In addition to “UNSUBSCRIBE,” email messages may include links for opt-in/out preferences or any other related operations. But the “UNSUBSCRIBE” link shall directly unsubscribe them from all. 

† A weak single-click opt-out law already exists.