I being a conservative, we should also keep in mind that this prediction for next 2 decades is taken from past 1yr of indian economy. BUBBLES always and has to burst.
Because of this boom, there are many unhealthy growth. Real Estate is simply zooming in pricing. In the name of demand in jobs, education quality is going down (I bet in AP,TN,KAR and MH B.E.degree is not of that standard which was a decade back)and mind it, not all sectors are booming, many sectors are left behind like local industries and small scale factories. lower middle income group and lower income group are stagnent in their prosperity.
All said, being an Indian, I wish what have been said by the author to come true without any hurdle.