That is an interesting observation. I wonder how much of the advent of "talking over doing" is related to the development of mass/social media.

Influence can propagate so easily through mass media, meaning that it is now possible to generate enough business interest just through "hyping" (it's difficult to achieve this when messages have limited reach) --- combined with the fact that it is often cheaper and less risky to "talk" than to actually "do", we end up with a culture where hyping is preferred whenever possible.