Its an interesting idea and the engineer in my agrees with you. Then the product skeptic says that anyone who wants to ride a bike as a form of exercise and get around using a bike, would probably just ride a normal bike.
2. there are rides I do where I am going for the exercise. There are potential rides I want to do that I can't because I can't afford to be covered in sweat when I arrive. I dont' necessarily want to have TWO bikes or maybe I dont' mind getting a workout on the way home where I can promptly take a shower.