Ether and Bitcoin will be the base layers of the non-USD and non-YUAN financial system.
The gold standard was dropped for good reasons. It couldn't expand at the GDP growth rates and storage/transport fees were significant. Gold backed fiat solved the latter, but not the former.
The problem is that even smaller quantities of $100M or $100k would have larger relative overheads. Once you're down to $1000 or toz size quantities where security is less of an issue, the testing and weighing costs become significant.
Only theoretically. The USD is the cleanest shirt in a pile of dirty laundry. Neither the euro nor any of the BRICS currencies are getting any cleaner.
Meanwhile Brazil (22B), India (122B) and China (380B) run multi-billion dollar trade surpluses with the U.S.