In your conversations with manufacturers, have they ever said or hinted at why they have not or will not adopt DNG?
I guess it then will limit their innovations:
1) case in point = Panasonic, software optics correction and the time it took Adobe to provide a new version of DNG to accomodate that.... so should Panasonic wait for Adobe ? should Panasonic try to put the necessary information into some tag where all proprietary information from manufacturer is stored as one big binary chunk of data ? should Panasonic disclose their development to a 3rd party (Adobe) if they were trying to keep that in secret ?
2) case in point = Foveon raw files - Adobe still do not store the information natively (for how many years no proper support ?)
who adopted DNG really among companies w/ marketshare > 0.0x % ?
4) Leica (for cameras that are not rebranded Panasonic's)
what happened now ?
1) Samsung dropped DNG support after they stopped rebranding dSLRs developer by Pentax
2) Ricoh purchased Pentax - you have one company instead of 2 now
3) Leica still uses it (for cameras that are not rebranded Panasonic's)
neither are actually innovating anything just using 3rd party sensors... companies that do design/make their own sensors are not going to be bound by a standard (Samsung's move, as their do their own sensors, is a perfect example - once they were no longer using based Pentax designs, where DNG was inherited, they dropped DNG immediately)