"Today it is a language of integration."What Nandan really means is that Hindi can only disintegrate us, but English can integrate (this is something he says in his book, too).
One language can never achieve national integration in India
While it's true that Hindi can only achieve national disintegration, not integration, neither English nor any one language can achieve the integration of India.
English can remain as the language of communication between different states and in the union cabinet in future only under three flawed assumptions: (1) that Indian languages don't have what it takes to get out of the kitchen, (2) Language translation professionals, software and hardware can never do a sufficiently accurate job, and (3) one country necessarily requires one link-language. That all three assumptions are flawed is being increasingly understood by people all over the world.
Hindi, of course, can occupy that office only under one assumption: that Indians are going to remain stupid.
All the national languages of India can and must be used in matters of the central government and between states - just like in Europe. That is the only true integration of the Indian sub-continent which is so linguistically diverse. When dealing with foreign countries, any Indian language must be deemed equally fit. It should come as no surprise if Veerappa Moily talks to Barack Obama in Kannada through either an interpreter or a piece of translation equipment. We mean surprise to Hindi Impositionists or Infoscion Thinkers; Obama won't give a damn whether it's Hindi or Kannada or English as long as communication can take place.
The bigger problem with Infoscion thinking
The question of language entails an issue closer to the hearts of Indians than national integration: food. Here too, Infoscion thinking (which term we now use for "English is all" thinking in general) proves inadequate. According to Nandan Nilekani and his friends who put their hand in the fire for English, English is also the only language of food, the only language of education, the only language of employment, and the only language of globalization. That's the problem with this Infoscion thinking: it implicitly considers India as an English-language call-centre writ large.
English creates a have-havenot divide within each state, and therefore in the whole of India. That divide doesn't exist inside Infosys because of the way Infosys is defined. It exists outside. The problem is, Nilekani isn't looking outside. That divide doesn't exist within the 7% Indians who are proficient in English, but it exists outside. The problem is, Nilekani isn't looking outside. He only seems to be.