It does not really change anything in reality, players will still call “play on”. What the change does technically: It takes away all potential “violation” calls for not calling “play on”.
Before, it depended on how you interpreted “should”. If you interpreted it on the “may” side of calling violations, nothing has changed. If you interpreted on the “must” side, then the rule technically asked every single player on the field to call “play on” once they realized it — and this never happened in reality, so one could have called violation every time this rule was invoked in practice.
We did want to change the rule to align with common usage, and since you can not pin the violation to a specific player if it is not called, we opted to clearly make it not a violation.