It could happen, just as it has with aviation, time was a time record run across a given distance would be measured from take off to landing but in more modern cases it has been from a predetermined point once the aircraft is airborne to one before it commences its final approach to landing and yet others where it is simply over a given distance between two points at full speed.
But human competition in running is all about the total package from reaction time off the blocks, acceleration, average speed and stamina.
So I can't see it happening myself.
