Lets stay on the topic of your original gripe with my comment, which implied that without an alternative the USD system can't collapse, and you've heard these complaints since the 80s. Why do you think that is? Why can the USD system only fail in one way? You never addressed that besides going "nu uh"

Who has a super abundance of USD that wants to purchase such enormous volumes of consumer goods

Historically that would be the US itself since they hollowed out domestic industry since they could import everything with their exorbitant priviledge. What would stop them from printing even more to keep doing that if it's also the expedient answer? Which is also the core of my whole point here... they're cutting down the trees planted for them by prior generations and we're at the can now.

Overall it seems to me that you're arguing swans can only be white as all swans are white, and there's no evidence of black swans existing. You don't make an alternative to the USD if the USD is working well... I think you have it backwards. An alternative will be made to get around the USD whicj will kill it. Not because of the alternative existing but because the USD failed in it's promises to those that use it. But thats not the only way it fails...

Besides, any time a reserve currency has been replaced historically there usually isn't anything waiting to take up the role right away. It develops after the global trade currency devalues so much it stops being useful for international trade. The pound failed progressively over decades and was replaced with domestic forex temporarily until Bretton Woods solidified the USD as the replacement post WWII.