A mutuality between the Indian rupee and the Chinese yuan

In their time, Indian and China were economic giants. The odd thing is that it never occurred to them to conquer the other - not like the whites who perpetrated a genocidal conquest of the N. America continent, Central America, the Inca Empire of Peru and the aboriginal continent of Australia.

Now, finally both nations are on their path of economic revival. It is our surmise that by 2030, these will be in the top five economic giants of the world according to this hierarchy:
                                                China
                                                India
                                                ASEAN
                                                Japan
                                                Europe

Now, if India and China can agree to a trade arrangement in which they can use their respective currencies to pay for their goods, whenever they wished to do so, this arrangement will be an incredible catalyst for the explosion of trade between these two nations . . . FOREVER.