The only way that i can see USD becomes weak is when they are no longer the world power, but as long as they are still the world power to decide on what to do in the world and how to handle issues of other countries, the USD remains the most used currency for international trade because all most all the countries in the world that is rich is connected with doing business in the US. The BRICS wouldn't be able to have one currency that will be able to superior over USD, only if they can join force against US to take over world power which will be impossible. US is connected to most countries for business in one o two ways.
What you're talking about is nearly impossible to happen and even if BRICS were to band together because the influence that US have on other countries is just too deeply rooted that it's hard to get them out even if a lot of big countries are going to try because we're so used to USD as a means of exchange, it's difficult for us to let it go, to me that's the simple answer why the world won't get tired of using USD.But what is happening now is against the dollar. Countries that oppose the US make BRICS the eyes of the world. That the US and its Allies have made their currency a weapon. Storing state assets in US and allied banks can be frozen at any time if a country does not comply. The countries that are members of the BRICS are starting to get bored and want to abandon transactions using Dollars or Euros, a big move to save this country from pressure from America and its allies. Even though it will take a long time, I think there will come a time when the dollar will be abandoned and will no longer be a currency for international transactions.
