@faab64 my understanding, and IANAL, is that: as Israel don't recognise the ICJ, for some reason, they will try to ignore it. However it will have an effect on that countries that do recognise the ICJ, most of the world, as they are this more likely to be held to be complicit in any offence if they ignore the order.
@SubtleBlade I really wish you were right, but sadly, after following Israeli impunity in the past 45 years I am kind of hesitant to celebrate this as a win.