I did not expect it to be so difficult to produce a confident answer to this question:
In 2030, the MLB record velocity will be _____ and the average fastball velocity will be _____.
The background for the question is that velocity has been going up for as long as we've had good measurements for it. That's true of most other athletic skills we can isolate: In the past century, the marathon record has dropped by nearly an hour, the 100-meter record by about one full second, and the 1,500-meter freestyle swim by more than seven minutes.