I am of the opinion by 2025 Indian will be the number 2 economy.
"The truth is that China is not the socialist market economy the party describes, nor moving towards capitalism as the western consensus believes. Rather it is frozen in a structure that I describe as Leninist corporatism - and which is unstable, monumentally inefficient, dependent upon the expropriation of peasant savings on a grand scale, colossally unequal and ultimately unsustainable. It is Leninist in that the party still follows Lenin's dictum of being the vanguard, monopoly political driver and controller of the economy and society. And it is corporatist because the framework for all economic activity in China is one of central management and coordination from which no economic actor, however humble, can opt out."
Power, corruption and lies | World news | The Guardian
China's present authoritarian goverment stays in power, mainly two ways, force, and corruption. In a more democratic system like India differant market and poltical difficulties will be delt with in a way that allows the pressures to be dispated, in China soon or later they will cause an implosion.