As the US already has "Forever" stamps in use for First Class Mail and "Global Forever" stamps for international mail, this seems like a natural extension, although I wonder if confusion by the general public could become an issue?
Quote:
The proposed classification changes (Attachment A) have been approved by the Governors, effective April 26, 2015, and add non-denominated, non-expiring ("Forever") status to stamps for five different First-Class Mail stamp categories: 1) a postcard stamp; 2) the two-ounce letter stamp; 3) the three-ounce letter stamp; 4) the additional ounce stamp and 5) the first ounce nonmachinable surcharge stamp.
...
It is expected that the conversion to Forever stamp status for these additional product categories will reduce Postal Service costs for inventory maintenance and stamp distribution. Once the new categories of Forever stamps are in place, future rate changes should no longer require the retrieval and destruction of outdated denominated stamp stocks and replacement with new denominated stamps. In addition, the ability to continue producing a particular Forever stamp design, without regard to price changes, will enable better management of stamp printing.
http://www.prc.gov/docs/91/91834/MC...PSNotice.pdfhttp://www.linns.com/news/postal-ne...rever-stamps