"If the dollar loses its status, it will be because the United States is no longer respected and strong in the world. It will be because we've accumulated a set of untenable debts," Summers added, calling the dollar's lack of dominance in that scenario the "least of our problems."
That's quote from Summers. He's right that Yuan will not going to overtake Dollars soon, but I believe he's not quite precise on the Dollar will loses its status because US no longer respected. However more likely due to non west financial market loosing more trusts with US.
US financial market is more reliable market then Chinese financial market. That's for sure, however weaponising USD and US leads western financial markets is making Non Western market loosing trusts on Western financial markets reliability and impartiality.
What is the biggest strength of collective west? Technology? Military? Well the biggest strength of collective west is actually their financial markets. This make collective west especially US can have unprecedented debt and large accumulation of capitals. If non west countries in average have similar debt level as US, most likely their currency already plummeted, got hyperinflation and large run on their markets.
So trust on the Western lead financial markets is actually the main thing that make others still want to trade their goods with US lead currencies basket. This in the end give opportunities for US lead west to accumulate more capital much larger then their actual proportion on global trade.
This is what many Western market players already warned Western Politicians in the beginning on Western drive to punish Russia. Punish them by giving weapons to Ukraine, by close access to Western goods market. However don't touch Financial markets. Don't weaponising Western Financial markets. It will bite West back as non west will lose trusts on Western financial markets reliability. The situation is not the same as in 90's, as non West capital and portion on global trade is increasing.
Now US-West lead financial market still control close to 90% of global payment transaction. If Western Financial market lose the shares toward 70% or even 60%, this will reduce US lead market abilities to issue debts to Global market. This's then that will make US current debt level as untenable (as Summers warn). Because current US and Western deficits actually issued at the basic assumption US lead financial market still control 80-90% global payments trade. Thus strong demand on USD and allies currencies.
If non west will not going to buy USD or Euro as much as now, as they don't need that much USD or Euro for their non west trading. This will in the end further limit US and it's main allies on issues debt to the market. This will reduce US and West abilities to run deficit. Which means has to reduce government spending including Military ones.
Financial markets is the main strength of the Collective West. Those who wants to end US unipolar dominance knows well the most effective way is to reduce Western financial markets dominance. Ironically now Western politicians are the ones that reducing that dominance.