I think you've hit it - this First Free Ascent set a benchmark. Others - maybe '001sky - can improve upon their time.

For example, a much easier, more popular route - The Nose - wast first free climbed by Lynn Hill in 1993 in four days, in 1994 she re-did it in 23 hours, in 2005 Tommy Caldwell and his then wife did it in four days and two days later Caldwell did it by himself in 12 hours. The time required has been falling since with Alex Honnold and Hans Florine, making the current record ascent in 2:23.46 on June 17, 2012.

These guys bagged the First Free ascent of a much harder route. Surely others will attempt to free the Dawn Wall and may do it in less time. It remains to be seen if it's humanly possible to do something this difficult in under a day.