While I generally agree with the conclusions of the article, I think PADI and all the other major agencies would be better served teaching their OW students how to be better dive buddies.
The biggest problem with the buddy system is a general lack of awareness that stems, in part, from the fact that almost all OW training focuses on the "what" rather than the "how" of the buddy system. How many OW instructors teach their students the "lead-follow" method of diving rather than teaching them side-by-side positioning ... where they can more easily see each other? How many teach their students that putting on a scuba mask eliminates their peripheral vision, and therefore they must make a conscious effort to turn their head from side to side to maintain an awareness of what's going on around them? How many teach their students to SLOW DOWN ... because it'll not only help you see more, it'll also help you keep better track of each other. How many OWSI's even think it matters?
Most new divers make poor buddies because their overall skills are so weak that they have no mental bandwidth to think about their dive buddy ... they're too overwhelmed just trying to maintain a position in the water to remember to do anything other than breathe. And with the preponderance of digital cameras in the hands of poorly trained newbies, the buddy system simply doesn't do what it's intended.
But rather than "just say no" to solo diving, the training agencies need to address the skills issues that would make the buddy system a more palatable option. Of course, that would make for longer and more expensive classes (and probably lessen the need for con-ed "specialties" ... so I don't see it happening). But the real issue here isn't solo diving at all ... it's better training.
Those who lack the skills to be a good dive buddy will also lack the skills to be a responsible solo diver.
... Bob (Grateful Diver)