So what? The trade route only just opened up. The numbers started at
zero and started only recently, so of course they are small. By how much the trade is going to increase and at what rate is what everyone is arguing about. People underestimate how
large Eurasia is along its east-west axis and how underdeveloped it is in parts. I predict the naysayers and doomsayers will be eating their hats.
In nominal terms the US is the world's largest economy. Let's put it at ~$20tn gdp nominal with moderate growth. EU is about ~$17tn with less than moderate growth say and China is about ~$13tn and growing fast. Problem is that EU and China are at opposite ends of the Eurasian landmass. Anything that reduces trade times and cost between the poles of this massive continent and interconnects a combined ~$30tn economy is going to have an enormous impact.
But even so the article contradicts itself.
“The overwhelming majority of China's trade with Europe is by sea and air. Overland routes don't cut it”
What the detailed stats show is that by value rail is 2% and road is 6% of total trade. (Air is 28%). Take into account that,
“Just 10 years ago, regular direct freight services from China to Europe did not exist. Today, they connect roughly 35 Chinese cities with 34 European cities.”[1]
And that,
“Rail services are considerably cheaper than air and faster than sea”[2]
So 2% of trade captured in 10 years. So if people stop thinking in terms of years and start thinking in terms of decades it is obvious that improvements in land logistics will far surpass those of sea and air. By the middle of the century it is anybody's guess what fraction of total trade will be capture by road and rail but it could be very significant. From my reading most analyses put Khazakstan as one of the major bottlenecks, an upgrade there could have huge knock on effects. (And that's not even taking into consideration different sized rail gauges.)
[1] https://www.csis.org/analysis/rise-china-europe-railways
[2] https://csis-prod.s3.amazonaws.com/s3fs-public/180228_fig1.p...