The shorter look is definitely coming back in track & field as evidenced by these recent vidoes.
If short shorts are in becoming vogue for track and field, I wonder why short trunks and speedos aren't coming back in swimming.
https://www.youtube.com/watch?v=P4x5xOI5YYc
https://www.youtube.com/watch?v=qf5BQfTCriw
https://www.youtube.com/watch?v=v9-sqfQ1t5U