RE: BRICS would be the end of the Dollar Dominance, How about Crypto?

I recognize that I am a functional illiterate in these matters, but I dare to give my opinion, based on what I think and believe may occur.
It is certain that if the dominance of the dollar falls the crypto market must also fall because its fundamental backing is the dollar. But, isn't the majority of world trade also.
I believe that a key aspect of this analysis must be the direction or predominance of the currency that dominates the world or the strongest one, and that is where the market will go and the cryptocurrency market will move towards it.
Several questions are in the pipeline:
Will BRICS succeed in ending the dominance of the dollar?
Will the United States allow this to happen?
If so, which currency will prevail?
Will the BRCS group succeed in having a common currency that can compete with the dollar and topple it?
What will happen to the Euro?

I don't know if I contributed to what you are asking for, but this is what I think about this.
Cheers and best regards.