nashvillwill, Rotation will garner the most mileage that a pair of tires can deliver, same as with tires on a car. I doubt that there will be an issue with your worn tire on the front as it appears to be in pretty good condition.

Brad

PS To answer the question, I haven't rotated the tires on my roadies as they don't have much tread to start with. The touring bike's tires do have some tread and I think I'll rotate the tires on it.