Yeah, saw this the other day.
I'm glad its release is being delayed since it sounds like they are trying to do too much too soon, and based off what I know of how it has progressed - there is no way they could have met their original goals.
I've half-jokingly referred to it as the "Bible", and probably have even done so on this board. When I've said that, I have largely been referring to the fact that it is a major driving force that guides a number of attitudes and decision points in the field, and is given far more authority than I think it should be. Just like the bible, there is very little reason to believe it is accurate, but people still have faith that it is and act accordingly. Are depression and anxiety REALLY unrelated disorders that just happen to co-occur on a regular basis? We often treat them as such. Millions and millions of dollars of public money is spent doing research that examines them in that way. Treatment studies are expected to make sure individuals meet diagnostic criteria...the number of researchers integrating a dimensional approach into treatment research are minimal. I imagine it would be very difficult to get funding for because again...the system. I don't think the comparison to the bible is unfair at all...in fact your post kind of forced me to think through it, and I'm now even further convinced it is treated as a bible in this field.
I think the biggest problem is just meeting so many diverse needs. We pretty much know for a fact that many of the foundations on which we have built the DSM model of psychopathology are just flat out wrong. However, our mini-society has been structured around those foundations so the question is when to make the shift.
For example, the literature on taxonomy of MDD seems to converge pretty clearly on the idea that it exists on a continuum. In contrast, I have seen precisely zero support for the magic number of 5 in the current manual. Differentiation from anxiety is a related issue, but for now I'm going to focus strictly on depression. If we want the DSM to accurately reflect how the world works, then obviously we would need to remove that. However, thats hugely impractical. It makes things far more complicated. Its pretty incompatible with our current system of healthcare. So is the job of the DSM to be the "truth" or is it just a framework for operating within the system? At what point do we then decide its time to change the system?
Its a thorny issue, but a critical one. The broader goal of my research program basically consists of re-formulating our entire conceptualization of psychopathology, so its one that is very near to my heart. I think for this to work, research needs to lead the way and we need broad acceptance and implementation of a new diagnostic structure across the spectrum before it makes it into the mainstream. Right now, there is a DEFINITE divide even within sub-facets of the research community, let alone the clinical world. Unfortunately, the research world has its own set of systematic barriers and other problems that prevent that from being easily resolved.
So its a process, and a tough one. I wish I knew what could be done about it.