I suspect this is partially true.
The world has relied on the US to uphold the system of global trade that was implemented towards the end of WWII (Bretton-Woods agreement).
This is expensive for the US and, amidst an atmosphere of increasing competitiveness 'against' the US, the best thing America can do is pull-out and let tensions amongst geopolitical neighbours fester as they would have naturally.
The incompetence of the US is the excuse:>Help us!>We can't!
Meanwhile, America (which sits far away from the shitshow that will become Europe once oil from the ME becomes unreliable) waits for the region to fall upon itself.
And, in a decade or two, once the geopolitical shitshow runs its course, exhausting every nation in the process, the US steps back in to reassert itself as the Super Power last standing.
The important thing to realize when analysing North America is that its geography allows it to be relatively self-sufficient (and isolated) when compared to elsewhere on the planet.
America's "fall" hurts the rest of the world more than it hurts America.