If different entities do not all trust the same centralized party, then it is not happening. You are pulling a spherical cow again as an answer. What is so hard to understand about that?
Why do you keep arguing about a space you're clearly unfamiliar with?
To make an analogy: I don't need to know all of the details of foreign trade and banking regulations around the world to know that people can use blockchain-backed cryptocurrency to send money all around the world in a way that is faster and cheaper that any banking or remittance company ever will be able to.
As blockchain tech matures and gets easier to be adopted by the masses, it will not matter if currently we have a gazillion different banks and if companies each are using their own ad-hoc method for managing world-wide transfers and FX: the moment that consumers are able to say "I want to use my crypto to pay for this", companies that are not on-board with that will simply lose business.
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To sum up: you are arguing that the status quo is the only way to make things and that the only way to have any change is when they are of interest to the status quo. I am arguing that the status quo will not matter the moment that blockchain technology gets more accessible and makes more economical sense as a way to verify and coordinate work among entities that do not trust each other.
What matters in the end (to quote from the OP that started our discussion) is "The whole paper trail around a bill of lading isn't a joke if you are shipping from say China to South America". This is something that blockchain is basically designed to solve. It doesn't matter if the companies now don't want to use it, when the people holding the purses start asking for a solution that only blockchain can solve efficiently, the companies that don't adopt will lose business and fade away.
So you're extrapolating a general principle that has yet to be proven anywhere into an industry you know nothing about. Great. This sort of attitude is part of why folks generally sneer at BlockChain enthusiasts.
> you are arguing that the status quo is the only way to make things and that the only way to have any change is when they are of interest to the status quo
You keep building a strawman of my argument that's easy for you to tear down. Are you aware that there are more choices than "status quo" and BlockChain?
> when the people holding the purses start asking for a solution
That's the thing, consumers DGIF, and have proven this for generations by purchasing based on cost and quality alone.