Buddy, those Billions of Dollars are only useful for buying technologically advanced instruments from those same foreign countries where these talent pool is migrating....
Its like a vicious cycle.....talent migrating from India, aiding in technological advancement in some foreign countries...those countries are developing and India is buying technologically advanced products from those countries.......so, who is the ultimate gainer here??
IMHO, only money can't help an economy grow....if it were the case, then printing money would have been the solution to all economic woes.....
It is Technological Advancement which is the key.....and such advancements can only be achieved through talented brains which are nurtured in India but gives result abroad.....
Countries like U.S.A, U.K. etc are making huge strides in technological advancement which is helping them keep their 'super-power' status only due to such 'BRAIN GAIN'.
This is huge loss for India's own technological advancement.....
That is the saddest part....India is such an unfortunate country that it cannot create enough opportunities for its talented masses.....they're forced to leave their country in search of better opportunities and thereby contributing in the development of an other country....