Have to disagree with this 100%. A touch typist can always hunt and peck if they want to or need to for some reason (would love to have a reason for this being a benefit though). Being able to touch type helps greatly with just about everything when you are using a keyboard. Sending emails, writing letters, filling out forms, coding, the command line and so on.
Not only that but it's extremely easy for the average person to learn to touch type (I learned from a book and was proficient after about 3 week).
I really can't think of a good reason (other than taking the time to learn which as mentioned is easy enough) to not learn to touch type. I think it's one of the least talked about productivity boosts out there.