The US dollars role as a reserve currency has become obsolete and the incentives to keep capital in America are not so great anymore, comparatively speaking. As the speculative bubbles of the last decade unwind you will see a dollar crisis like no other that will drive gold to $5k, or $10k, maybe higher if someone like Sanders ever got in and turned America into Venezuela.
I disagree with the above.
Here is the IMF data on reserve currencies:

which comes from the following article:
https://wolfstreet.com/2020/01/02/us-dollar-as-global-reserve-currency-chinese-renminbi/The dollar is very far from being obsolete, mainly because all the other currencies are performing worse.