Indus Valley collapsed before the migration of the Indo-European Aryans who arrived from the Eurasian Steppe, after the collapse of the Indus Valley Civilization, first conquering a complex of an older settlement called BMAC, after which the group split into three, Iranian, Indo-Aryan and the Nuristani groups.
If the Indus Valley Civilization, covering Pakistan, India and parts of Afghanistan did recover and rebuild before the arrival of the Aryans from the Eurasian Steppes for whatever reasons including Aryans spending more time in the Steppes or the Indus Valley rebuilding quickly after the collapse due to Climatic reasons or anything like that, what could be the effects? Would the Aryans be inspired by the advancement of the Indus Valley and start building their own versions or try to conquer the built up ones? What could be the immediate and long lasting ethnic, social, religious and migrational effects in the whole region from Persia, Central Asia to India?