if OD, KM, ISD and other siloed disciplines are declining, is there something new emerging?

I keep coming back to this quote / question, and pondering ...

Can you (or anyone else) help me understand how OD is a siloed discipline ? I can understand that applying / using OD in a siloed area of an organization might focus just on the activities in the silo, but my understanding of OD has always led me to believe that it is aligned with, or at least appreciative of, whole systems.