DarkStar
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Why does the simpler theory of a natural diffusion of people and culture to the East not work for you?
Respectfully, I do not think that there is even evidence of that.
The Harappan Empire had already expanded to the areas of Rajasthan and Northern PUnjab and U.P, and the most famous site in Rajasthan Kalibangan was actually abandoned around the same time as Mohenjo Daro was.
Nothing of the culture, customs, arteifacts, designs, architecture of the Harappans can be found in the later doab settlers.
The decline of the Harappans was not sudden, but a gradual affair, over many centuries. The later Harappan era is markedly different to the early and mature phase, because of the lower quality of the utensils, artefacts, etc.
"Dispersal or dilution are evident from the prevalence of non Harappan pottery styles, impoverishment and disruption from the gradual disuse of the script and from the disappearance of the more fanciful manifestations of Harappan culture, including that obsessive standardisation"
The impoverishment was gradual, as the later ceramics lost their quality, the weights lost their uniformity, the roads lost their alignment.
I think a prolonged economic recession might be one of the main causes of this dissolution, especially the decline of trade with other civilisations which underwent their own upheavels.
It has been proved that the Harappans invested much of their surplus in commodities, which they exchanged with other civilisations. The decline in this trade would have forced them to leave their cities, and concentrate more upon agriculture.