Before Bolt came along, there was fairly wide scientific consensus that the limit would be reached at around 9.4-9.5 seconds. Now that’s Bolt’s run 9.58, surely the limit needed to be reevaluated. If there’s anything we’ve learned about the “limits” of human performance, it’s that they’re anything but static. They better be described as “current estimated maximums based on current best performances, training methods, etc”.