Unless they work with the BRICS nations to issue a gold-backed yuan, which is the current plan. If there is a question to the stability of the dollar, this would become an alternative to the dollar for trade.
Good.
The current strong Dollar harms the U.S. economy.
A weak Dollar will improve the economy by making domestic goods seem cheap while making imported goods look expensive.
We don't *want* the Dollar to be the world's reserve currency.
A strong Dollar props up the rest of the world at U.S. expense.