Following up on a post I made to the American Numismatic Society's email list, the Nov. 4th edition of the Numismatic Bibliomania Society's (NBS) E-Sylum discusses DNIDs. Search for the headline "ANS OPENING UP COLLECTION DATABASE TO WEB LINKS AND SEARCHES".
The NBS is "a non-profit educational organization founded in 1980 to support and promote the use and collecting of numismatic literature." It is within communities such as this that the use of DNIDs can lead to the widespread adoption of actionable identifiers.
[Update: direct link from Wayne Homren.]