Is China's New Silk Road Initiative being designed to solve these problems for the vast majority of the world?
As I understand it the NSR will link Africa, and India, to China, Russia and Europe ,with no need for seaports that are subject to problems linked to sea level rise.
Once the new routes are viable, they immediately provide redundancy. If the NSR should prove to be more economical & the present ports eventually fall into disrepair, the rail links may still be more diffused and less dependent on major transportation hubs dangerously close to sea level.
North, Central, and South America could design a competitive, land based transportation system, but geography won't be on our side. Piping crude from Alaska to the Gulf is being done, but moving goods from Rio to Toronto by rail might never prove to be practical.
Terry