I do note that you conflate two distinct issues: whether touch-typing is worth learning, and whether Dvorak is a meaningful (or any) improvement over QWERTY. I am definitely far more suspicious of the latter claim than the former (see my link in the grandparent for a thorough debunking).
Even the studies cited by the author in your link show a speed advantage of around 5% for Dvorak over Qwerty. Considering my point of the 10k hours, the payoff is more than worthwhile, before even taking RSI into consideration.
On a side note, one of the reasons I decided to learn touch-typing was because I have some free time at the moment and was looking for something else to do than read blog posts all day, so I totally agree with you that investing 30-40 hours now might not be the best for everyone... TDT probably recommends it though.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.