Look at the history of civilization and the history of reserve currencies. When Britain had the reserve currency, how did we describe that? It was called the British Empire. When Spain had the reserve currency, what did we call that? It was called the Spanish Empire. Go back for thousands of years, the history of reserve currencies is the history of empires.
Until, supposedly, we get to this great break in history with America's dominance. Which supposedly is not an empire but is based on some superior ideology or system. Is it not remarkable that up until now history was one way, and now the age of empires has gone away. And only America's luck, or ideology, or democracy, or some technical economic bullshit has supposedly created the massive advantages for America and American citizens.
There has not been a break with history. The United States is the most dominant, powerful, and yes brutal Empire the world has ever seen. Reserve currency status has been maintained by rigorous continuous ongoing military campaigns involving both overt, covert and financial means. Libya is one extremely obvious example.
The question is not something like, are we being nice enough, or are we 'leading the world'. The question is can and will any group really take geopolitical action against this domination by force? If and when they think that it is safe enough to do so then they will.