I think we need to create bigger ports too. A monster company like Maersk probably think that the bigger is the better in terms of transportation cost. So, if they are right, the world countries need to upgrade all their ports for this new "standard size" for cargo ships (or they think they can create bigger ones in the future?).
Other companies need to built bigger cargo ships too, and probably decide about a standard and innovations like how is the best position for load/unload this massive ships.
Also, I think they have to maintain their short ships too. Let the bigger ones do the massive transportation and the small ones implementing something like a tactical supply in short routes (and support to the bigger ships before and after their standard routes).