I can't imagine that will catch on. After all, the special thing about RAW is that it usually (not always - some manufacturers are already playing games with the data here too) contains the raw data from the chips. And those are definitely not always identical. At least with high-end cameras. Just think of things like Foveon or Fuji CCDs.
But I've already experienced firsthand what joys RAW formats can bring with software: for exactly that reason, I still use an old version of iView Multimedia Pro, because the newer versions can no longer import CRW data. Ok, it's the fault of the software manufacturer, who is simply too incompetent to transfer bugfixes from one version to a new version, but it's already a hint at the fun that these wonderful digital negatives bring us. I can also only read my images from the Kodak DCS 520 with Kodak's own software; other software can indeed read Kodak RAWs from newer models, but not the old ones based on TIFF (where Kodak used proprietary TIFF extensions). As soon as the Kodak software no longer runs on my Mac, those digital negatives are worthless there.
So a common format wouldn't be bad at all. Maybe you could make it flexible enough to really represent all variants - TIFF at least offers the technical basis for this with its tag format. Whether all programs can then read all variants, or whether one or another variant will be omitted anyway (and you'll be lost again for that reason), remains to be seen.
At the moment, interestingly, a proprietary format is probably the best choice for archiving digital negatives: the Photoshop PSD format with embedded EktaSpace color space. After all, it can represent the full color space (and a bit more - it was originally intended for archiving scans of slides) and the format has so far been readable by all newer software versions. TIFF with appropriately embedded color space would probably work too - but the layers are not implemented as portably there - not every program reads them the same way. With PSD, you can nicely save some preprocessing of your digital negative that you can always discard later. And PSD can be decoded by far more programs than just Photoshop.
Ok, I'll probably get around to converting all my RAW files to PSD in the next few days.
By the way, what I would really prefer would be if the necessary extensions were made to the PNG format and it could be used. But unfortunately things still look pretty bleak there with software support for the extended features. And to my knowledge, there is still no usable standard for storing editing layers.
At heise online news there is the original article.