We shouldn't give up our right to print our own currency.
We won't. No country will. I dont think BRICS currency is going to be as liquid as USD - the BRICS nations are not enamored with west's lending based economy in the first place. BRICS nations are not intersted in a currency that is post-industrial world currency like USD today.
They are interested in an industrial era currency, like the GBP/USD/DG used to be in the era of industrial capitalism : 1800s-mid 1900s: gold backed, which doesnt offer strong liquidity but it offers strong stability in actual money growth with industrial growth.
When you make FIAT currency, the main beneficiary is the finance sector, because they can move money so ez/create money so ez that 'money industry' becomes a thing. The main losers of this, are the manufacturing/resource extraction sector, because they lose the fundamental stability of long term cost projection, since the value of money itself fluctuates so much.
The west made its change, in 1970, at the zenith of its industrial might, thinking that disadvantaging its world beating industrial sector a bit to enhance & supercharge the finance sector will pay off in net results and till now, it had. But now with Global south & China rising in industrial might, the currency equation has come under pressure.
Don't get me wrong, nobody in BRICS is saying that BRICS currency is going to be a less liquid currency, because nobody wants to scare the bankers shitless and torpedo the project, but that is where this is headed.
I am not sure about how the countries retain control over this 'brics euro' but i think its lack of liquidity will lend itself to be a pegging standard to individual currencies that individual nations will control.