I dont really know anything about track,but yeah,if you already have the natural abiity and devote urself fully to the sport,of course someone will be able to break his record,there are so many people out there and poeple breaking records is like everyday stuff,you would be surprised.Dont tell me that there is no one isnt able to acommplish what he has.Like i said if someone have the potential and natrual ability and train hard/watch ur diet and devote their life to the sport,of course they can be better than bolt