I don't think this is going to lead to mass terrorist attacks here if that's what anyone is worried about.. They'll be watched and tracked like crazy.
If anyone wanted to become a terrorist or be influenced, they could easily do it in their own communities here or by being brainwashed by all of the propaganda on social media, YouTube etc.
Plus, aside from the Lindt attack which was mild compared to others around the world, there haven't been any serious incidents here even when Isis was at it's strongest. Nor have there been anywhere near the same amount of terrorist attacks in recent years in Western countries as there were several years ago in Paris, London etc..