Interesting article.
I wrote about this about a year ago.
Auto-Adjacent Segment Degeneration
I saw this in a client's films last summer. His neck looked just like mine and I could see in his flexion/extension images that the adjacent levels were not moving. That is what motivated me to schedule the cervical surgery... that I subsequently canceled.
Tough choices. There is no questions that sooner is better than later.... if you are successful!
Mark