The premise of the article is that cursive is the natural consequence of writing more efficiently. Individuals will write in their own form of cursive even if not taught explicitly.

This completely misses the point that people won't be writing enough to bother optimizing it with their own cursive style. Nor will they be writing in cursive frequently enough to keep up the skill.

How do I know this? Because this is the life I have lived. Moreover, I was taught cursive and have lost the ability to write legible cursive in high school and have reverted to printing ever since when I absolutely have to write with a pen.

Is cursive dead? No, but it is dying.