"...very, very olds new in social science circles."
So old, in fact, that it's often problematized in many fields that study different aspects of human culture.
One of the problems with a theory of sociocultural evolution is that it confounds often whimsical changes in human culture, which happen often within generations and that can have tumultuous effects on a given culture, with the slower, biological changes in the longer-term that Darwin had in mind. From this confounding of biology with the more abstract, higher-level semiotic systems that define human and, to a significantly reduced-degree, other animal cultures, comes a belief that human culture and the power structures that come about as a result of it, follow a well-defined and universal series of evolutionary mile-markers on their way to "civilizational" status.
In fact, A current but ever-present, historical example of the problems with these theories is the flawed dichotomy between civilization and barbarism (see
here and
here).
So, essentially, what Hawking has re-discovered is an age-old trope that saw a very real, and conspicuous apogee during the European wars sof Colonization and continues to this day (
here,
here and
here). But in fact, this age-old dichotomy is not common only to the western world--the Mexica (or "Aztecs") and their Andean counterparts, the Inca, conceived of many smaller groupings of indians near and beyond their periphery as savages and barbarians.
If there's an important distinction to be made in many of these civilization vs. the savage examples, it's that the technology that humans create can in fact follow an evolutionary trajectory (ie, one that gives us a better chance at survival as a species), but that the culture that produces it may arrive at different stages of that evolutionary path from wildly disassociated and subjective changes and vacillations.