He mentions the gravity model being a limiting factor. Huh? If anything, including the gravity model would sway the balance further towards China and away from the US. China is extremely close to a massive number of highly populated Asian countries, and can run inexpensive trains to Europe. The US has Canada (population 36 million) or Mexico (127 million) close by, but not really much else. As a result, China can inexpensively ship to ~5 billion people, and the US can ship to maybe 500MM. Throw in all of South America (only 400MM or so people) and the US's reach is still under a billion.
Some figures: Northeast US to southern South America is about 11,000 km straight line, which has to be done with a complicated series of trucks, trains, boats, more trucks, etc. Beijing to Eastern Europe is 6400km, and can be done with two trains.
I think that one of the big blocks for China will be regulations around product safety and manufacturing/labor standards. There will be also regional pride ("made in USA"/"made in Europe") products and specialized equipment (processors, optics, scientific equipment.) There are a lot of cases to be made, but I don't think this article makes any good ones.