Well the Sarasvati river and Indo Aryan migration are quite different topics aren t they As for the latter many Indians believe that archaeology is the main discipline that has a say on it But that is not true Since Indo Aryan means Sanskrit speakers it is first of all a question of linguistics Somewhat shamefully Indians are no good at linguistics shamefully because linguistics originates with Panini So their conclusions are all wrong Anyway this issue has been debated to death and we had an RfC last year which settled the issue once for all as far as Wikipedia is concerned Unless there is some new evidence that overturns the current state of knowledge nobody at Wikipedia wants to revisit that issue But I will check to see if the current wording is right Cheers