Failing dollar will take a very long time if it even happens. The dollar is actually pretty strong right now despite people trying to hype china pushing the yuan.
The dollar is strong because it is the global reserve currency. As more countries move away from the dollar due to factors like our use of sanctions, runaway debt, and a general shift towards physical asset stores of value, the dollar has room to rapidly weaken.
The dollar will be around for a while, at least another decade and change but it will eventually fade away as the reserve. Way too many people on the other side who want stuff. It's really not any harder than that. Hard for people that have only known running water and toilets their entire life to comprehend it. These people on the other side are tired of it. They want these things and the US is keeping them from having it. EV's for all...meh. Yeah no. Things are about to go in an entirely different direction. Can't just go around raping countries anymore.
The dollar is higher because of interest rates, war, lack of global grow and more onshoring.
Many US dollars are leaving China but growth is on the rise in China as the country moves into the next phase of preparing for war