I wonder what would be the likelihood of this happening in the U.S.?

EPO revokes Amazon’s “Gift Ordering” patent after opposition hearing – EPO.org: The so-called “Gift Order Patent” has been revoked by the EPO in an opposition proceeding today after a hearing involving three opposing parties and the patent proprietor, Amazon Inc. The patent relates to a method for purchasing goods over the Internet to be sent as gifts.

The contested patent specifies a method by which a person can purchase a product as a gift and have it shipped based on the e-mail address of the recipient. Based on this e-mail address, the system will then contact the recipient to obtain a valid postal address for shipping. This patent is not to be confused with the “One-Click” patent application, which was withdrawn after the first EPO examination and never granted in Europe.

One of the opposition’s main arguments against the patent – among others – was that it fell short of meeting the criteria of providing an “inventive step”, as defined in Article 56 of the European Patent Convention (EPC). On these grounds, the three opposing parties asked for the patent to be revoked.