I think Dave's points are sound, and that there will a continuum.

for me a point of understanding that (I think) people are coming to is that there can be combinations that incorporate btoh centralization and decentralization, hierarchy and networks .. and that these will increasingly be purpose-built and temporary / time limited .. hence the "two-way flow".

Some knowledgeable wags say that we are increasingly living in a "beta" world .. and I think that's pretty much the case. Solid, intended-to-be-static structures and institutions won't (as a generalization) fare so well in such an environment.