The world we live in is a unipolar world dominated by the US and  its European allies. But what China and BRICS are pursuing is to reduce dependence on the US and try to create a multipolar world. That means a world where power is shared, rather than concentrated in a single  nation . So even if China surpasses the US and becomes the world's number one power, it is unlikely to have all the power and influence that the US once had .  We will have a more equal and fair world, so there is no need to worry too much when the US is no longer the superpower and the dominant power in the world .