Nonsense. Even if the wind is blowing the right direction it doesn't have enough energy to move a huge merchant vessel at economically viable speeds. Do you have any clue about the mass and drag involved with something like a 20000 TEU container ship? There is no magic hull shape which can ever make sail propulsion alone make sense. This is basic physics.
Those same 20000 TEU container ships are famously susceptible to being blown about by winds when they loose power.
The stronger argument is that wind is not consistent or reliable enough for logistics. At least, not without doing a lot of extra math.
So I agree that sail propulsion alone won't happen at large, but it's an interesting question of how far in that direction commercial shipping can go with modern technology.
