Our position as the international hegemon is definitely in decline, but yeah outright collapse doesn't seem likely.
Look at Britain; just a century ago they were in the position we are in now. They're no longer at the head of global empire, but all their political structures and institutions still exist today prettymuch unchanged.
I think Britain was propped up by the US and the rest of the EU. They severed their connection to the EU which has already massively backfired, and the US won't bail out the UK anymore if the US is also collapsing