From what I understand, part of the reason for this trend is an excess of cargo ships. As a shipper it doesn't pay to rush cargo from one place to another if y

From what I understand, part of the reason for this trend is an excess of cargo ships. As a shipper it doesn't pay to rush cargo from one place to another if you have empty ships doing nothing. But I doubt this will continue. The reason is the customers don't like it. If I have a billion dollars travelling from Shanghai to LA I want it to get there quickly so I can sell my product and use that billion for something else. This is why much-more-efficient-but-slower airships could never compete with airplanes.