I commute daily with a hub dynamo. I still like to have a battery light as a back up, because my dynamo light is more of a "be seen" light, but you can get brighter dynamo lights, I just haven't spent the money yet.
For touring a lot of people try to do their touring during daylight, so a dynamo solution might seem like too much hassle/weight/expense with limited pay off. It depends on your riding style. I wouldn't want to be without mine.