In relation to recent discussions, latest (Feb 2017) GDP projections from PwC:
Note that India is projected to surpass Japan as the world's third-largest economy a mere decade from now. Given India's current and historical levels of military spending, continued economic growth will allow India to emerge as the world's third largest military spender in the same timeframe.
The projections for 2050 are clearly entering 'superpower' territory, both in their resemblance to acknowledged superpowers, and their lack of resemblance to the figures for all non-superpower nations.
India need to stop obsessed with the term "superpower", China never once said itself will became a superpower anytime soon, but yet all I hear from India is India superpower 2020, 2030, 2050 etc...
This is not good for your psyche.