Not so fast! According to this rebuttal to that specific article, it’s pretty darned biased and inaccurate itself, for several reasons! Before you conclude that you have indeed rectified matters, maybe you should read both sides of the debate?
In my own personal experience (not backed up by any studies, though I’d love to see some done), the main flaw keeping the Dvorak Simplified Keyboard from being more widely adopted is the positions of the letters [A] and [M]. Why? Because those are in the same positions as they are in the Sholes QWERTY layout! Why is that a problem?
When I was trying to learn Dvorak typing, despite already knowing QWERTY (the case for most modern computer users), I could do fine in keeping the Dvorak layout separate in my mind, right up until I had to press either of those two keys (and, of course, they’re both pretty common letters). Then, it was as if my brain (or “muscle memory”) would have about a fifty-fifty chance of “flipping over” to the other layout, and I’d type the next few letters as if from the QWERTY layout until I realized what’d happened, and I’d have to backspace and correct it. That also happened when I was typing on the QWERTY layout while trying to learn Dvorak.
If Dvorak were altered so that no keys were in the same place as they are for QWERTY, it might have a better shot, since this mental (or “muscle memory”) “track-switching” effect would no longer happen. As it is, it’s great if you’ve never used, and never will use, QWERTY. But how likely is that to happen?
I’ve switched to Dvorak. I had problems with mentally switching layouts in the middle of words as well, although I’ve gotten over it. (Although now at work I see the keyboard as Dvorak for a few minutes until I get used to Qwerty again).
The problem with A and M is just something you get over. I highly doubt it’s a majso reason Dvorak isn’t widely used.