Yeah, you're definitely right, but if one were to take my stance then biking would never have existed. The most supreme natural being (without tools of any sort) would survive and produce. However, that is completely disregarding the human brain which is really the most valuable and the reason all these inventions have come about regardless of the said reprucussions. It is evident that brains, as opposed to braun has increasingly more influence in selecting mates nowadays.
Really, I agree w/ you, but I don't think there are any other questions where I could make such a tangent as this.
Now that I got my whole (really pointless) argument out of the way, I'll say that we would be better off with bikes on the road, but it would be increasingly difficult to make longer treks. For instance, my brother works about 30 miles away from his home and it would be impossible for him to make the commute on a bike. So it would be better in some ways, but extremely inefficient and impractical when taking into account the distances many people travel today.
HOWEVER lol, if this were implemented maybe this would benefit local economies by keeping jobs closer to home...there are many, many other factors involved. I don't think it would be possible to implement. =)