I think people might be over-estimating the capacity BRICS have to become a new weight in the balance of power around the world. There are still many things they have to solve so they can become more efficient in achieving mutual economic objectives.

Russia needs to stop the war in Ukraine and renegotiate their access to the markets, otherwise the BRICS members could be affected in the future by the interest on the United States on Russia.

China and India are currently having political confrontations over some territory in the north of India. There has been reports of possible military confrontations, if I recall correctly.

Brazil is very close to the USA and within it's sphere of influence, which could be taken advantage of to fracture the alliance in the long term.

If BRICS wants to grow, they need to tackle those issues and work to include more countries in their block.