Lololollol BRICS, hows that going for 20 years now? Never, ever, repeat ever, going to get brazil india china russia to agree to a mutual currency that is 1. Sovereign, 2. Group controlled, 3. Utilized. Why? As an economist I'll tell you.
The basis of modern economics is to be able to control and manipulate money policy, mostly by interest rates, and also by money supply(printing), and taxation. They won't, cant and will never be able to agree on anything that would be needed to do so. So while china is cutting rates right now to bail out debt laden companies, Russia is tightening then to stop the ever falling ruble. Good in theory, not in practice. For fucks sake India and Russia can't even agree on what to settle oil payments with?!?!?