You would assume that the BRICS know all this.

So, are they flying a balloon to see if anyone takes notice?

Are the central bankers so desperate that they are trying their second and third string ideas to get a new world currency?

They know the Dollar is dying, and so far every attempt to supplant it has failed.
Even the shit they tried to pull in the Fed.

Like you said, making a currency is easy. (there are even web pages to make a fork of bitcoin)
But getting people to use it is hard. Getting EVERYONE to use it is next to impossible.
But, the thing that everyone uses for money just seems to come about.
And like BETA vs VHS, the best one does not always win.