Ma Long - January 2014 WR 1; currently WR 2
Zhang Jike - January 2014 WR 4; currently WR 102
Xu Xin - January 2014 WR 2; currently WR 6
Fan Zhendong - January 2014 WR 5; currently WR 1
Timo Boll - January 2014 WR 8; currently WR 4
Dimitrij Ovchtarov - January 2014 WR 6; WR 3
Vladimir Samsonov - January 2014 WR 10; currently WR 26
Niwa Koki - Jamuary 2014 WR 18; currently WR 9
Lee Sangsu - January 2014 WR 56; currently WR 8
Harimoto Tomokazu - September 2014 WR 836; currently WR 10
What might we derive from this data? Old players get older and slide down the rankings: Samsonov. Some players get injured and can't compete for rankings points: ZJK. Most compete backwards and forwards, ranking varying by small degrees: Boll, Ovchtarov, XX and FZD. Some make steady gains as they mature: Lee Sangsu.
Only one player listed has radically failed to follow one of those patterns.
How does that indicate that the entire world of table tennis has been radically changed since the introduction of the ABS ball?
Chen Meng - January 2014 WR 6; currently WR 1
Zhu Yuling - January 2014 WR 7; currently WR 2
Liu Shiwen - January 2014 WR 1; currently WR 5
Ding Ning - January 2014 WR 2; currently WR 12
Feng Tianwei - January 2014 WR 5; currently WR 9
Ishikawa Kasumi - January 2014 WR 10, currently WR 4
Samara Elizabeta - January 2014 WR 28; currently WR 19
Sofia Polcanova - January 2014 WR 99; currently WR 18
Ito Mima - January 2014 WR 60; currently 6
Hirano Miu - January 2014 WR 69; currently 7
Exactly the same patterns for female players. The two biggest movers are Ito and Hirano, but nowhere near the same as for Harimoto. Has the new ball changed things? Perhaps somewhat, but hardly affected the natural order of things.
What then to make of HT? My personal take is that he's an outlier. He was always going to be good, given his parentage, his opportunities, his work ethic and his coaching. The only oddity is perhaps his playing style does take advantage of a loophole (pun not intended) in Chinese technique which is a little more noticeable because the ball is ever so slightly different.
My prediction? He won't win gold in 2020, but he will make the most noise.