Is DEGOV a possibility?
No, it is not possible. At least not over the long term. Extremely weak governments such as what you describe will ultimately get overrun by stronger governments looking to expand. Look at what happened to the Indians in the early days of the United States.
Native Americans were centuries behind in technology and were outmatched by the settlers. The people absolutely would fight back against an attack. We don't need an organized military to do that, we just need some Americans that aren't braindead and still care about their freedom.
Decentralized governments will ultimately have a weaker military and will be less able to fend off attacks from stronger governments with a strong military. Decentralized governments also will not be able to spend as much to develop the 'latest and greatest' in terms of military equipment, so it would quickly become outmatched.