'No immediate change'
Don't be mislead into thinking that this means 'no change'.
A change has happened for sure.
But you won't lose your career for 2 years.
CASR 1998 Part 67.150 para 7
......... a person who held a class 1 medical certificate and satisfied the criterion immediately before the change, but fails to satisfy the criterion as changed, is taken to satisfy the criterion for 2 years after the day when the change is made.
It lets the change in standards go unchallenged for 2 years and then removes each pilots privileges at their medical renewal date thus not causing a synchronized uproar.
OOW