Michael, what incentives do the camera manufacturers have to adopt DNG? As long as Adobe, Camera One, DXO, Google, Apple and Microsoft all hustle with every camera release to provide the means to process the new RAW there is NO MOTIVATION for camera makers to change.
If however, Adobe, Camera One, DXO, Google, Apple and Microsoft were to form an industry consortium for DNG there might then be some incentive. This group might take the stance that they would provide RAW processing for new proprietary RAW camera formats only 6 months after their public release then you have a real economic incentive.