I agree with all who say a talk like this was long overdue. I also applaud any improvement Watchtower makes to their policies, regardless of their motives or whether it's not nearly enough improvements.
Yet I think this talk may even worsen the problem! Yes, parents are told to be vigilant. And they're told in almost all cases the abuser is someone the child knows, which is very useful information.
But with the common distrust of non-JW and the blind trust of all JW within the 'spiritual paradise', a talk like this should mention explicitly that abusers can hide within congregations as well. But all examples focus on non-JW activities.
This silently reinforces the very much false notion that only non-JW abuse children. This may make the parents even less vigilant towards inappropriate behaviour of JW towards (their) children. And it's other JW that are closest to JW children....