Water off a ducks back mate.
Not really. The point has registered, I think. But what adds an unreal element to our 'musings' is the evident fact that the IVC itself has no clear links to modern society in South Asia. If there are common civilisational aspects to the way people live in Sind and in Multan, for instance, or in Gujarat and in Rajasthan, on the other hand, those are drawn from quite a different common source.
There are no visible cultural heirs of the IVC. There may be heirs due to direct physical descent, but this is an heritage of little value, considering the years that intervene, and the numerous waves of migration and conquest that have swept through the region.
We have a decidedly strange situation, then.
We have several linguistic groups of strikingly similar cultural habits and ways of life. Two of these happen to live on the banks of a river which was the main seat of a vanished civilisation. Others are spread wider apart, some with a partial connection to that river valley, some distributed around proximate river valleys. All are united in claiming the vanished civilisation as their heritage, with little or no basis for such claims. Some point to their physical occupation of the same space; some to the stable genetic composition of the population, proof to them that the very individuals who created that lost civilisation live on in the genes of those who are there today. There is finally the emphasis on the inheritance of specific aspects, largely aspects related to theogony but including pottery, perhaps including linguistics, in the dissolution of the civilisation and the absorption of its cultural and physical aspects within a large area extending into the proximate river valleys, and from that to the entire physical space of the sub-continent.
The fact of the strikingly similar cultural practices that prevail among all these groups, those living in the hinterland of the river and those narrowly further away, are overlooked by one faction, and correspondingly overemphasized by another. The possibility of direct genetic descendants having been displaced during the repeated waves of migration is also ignored.
It seems finally to be nothing much more dignified than a squabble over ticketing rights to the wholly alien ruins.