Not to mention, when over 46% of the world is now part of BRICs and over 56% population is part of BRICs even the US knows that it's over exercised power is frightening with the Brics growing this fast in the last decades. Having to partner with more countries I even more signs that it's not to be compared with the EU in the nearest decade.
Europe might still look strong or okay in most people's eyes for now till the changes begin to have effect, just like you added Pooya87 they are lossing the spotlight already the demonstration in china is a hint that isn't widely understood by many, only those with four sights understand what the Chinese government is saying in action.
BRICS can add as many members as it wants, but will it be able to sustain itself forever? I doubt it. I believe the bloc will get smaller in the long run, as most member states (countries) will abandon it due to poor economic performance. Only China and Russia will survive due to their economic strength. At least, that's what I think will happen in the future. But rising "de-dollarization" efforts could change the game. Only if they prove to be a success.
So far, the US is the world's leading superpower. Even though it's declining, the USD is still used for global trade. It's the largest reserve currency of the world. This won't change for a while. It'll take decades, before the whole world moves to another currency. BRICS or no BRICS, we will live in a multipolar world for a long, long time.