What facts do you need?
The fact that there are English speakers everywhere in India? Come on down for a visit... the boatman who takes you around on the Kerala backwaters speaks English and his local language, not Hindi. So does a taxi driver in Mumbai or even the 'boy' who delivers tea at most offices all over India.
The fact that there are 26 official languages in India and most language scripts are remarkably different from each other. IDNs would get lost, specially with like sashas saying that most youngsters can't spell in their local language. More's the shame but that's how it is.
The fact that English medium schools are at a premium here. In fact, a lot more students pass out each year from English medium schools across India than through language mediums.
The fact that all major business, government and so much so even road signs across the country are in English.
The fact is that of 1 Billion people - at least 200,000,000 speak English. Online users who use other languages would be a single digit percentage as of now. And I don't see it changing dramatically for the next few years.
While it's true that in terms of sheer numbers the local language speakers are more, but that is not to say that local language speakers cannot or will not communicate in English, even with a choice to use their local language.
Yes language offerings like newspapers, magazines and even tv channels far outsell English ones but I don't see any of them using IDNs because while most people speak the local language they write in English...
The fact, language sites account for less than 3 in the top 100 sites visited out of India - check alexa.
Fact, the largest local language portals use English as the primary access language -
http://www.webdunia.com/
http://www.oneindia.in/
http://www.rediff.com/