I'm not sure that's so much an "article" as it is an "advertisement." Note that the only one they quote--who thinks the current ferries are so inefficient, and who touts this as such a great idea--is the guy who is trying to sell the "smart wings." Not exactly an unbiased source of information.
Yeah, it would be neat to see more sail-powered commercial vessels. And, if the day ever comes that such a thing makes financial sense, we will see it everywhere. But for now... don't hold your breath.
If you have ever seen the dozens of different ferries which ply San Francisco Bay, you would see instantly why this idea would never work. As Miatapaul says, there just isn't time to set - much less mess with - a sail.
Big ships are another story. For the last 25+ years, I have read stories about various plans to put some kind of 'sail' on ocean-going ships that would help save fuel. I have even seen photos of attempts to do that, although the apparatus (a sort of metal square sail arrangement) was apparently very complicated to run and prone to breakage. It is certainly an untapped resource that begs for a solution. But so far, pretty much all of it is pie in the sky.