I might be a bit optimistic for PS4 this year since its been up YoY so many months. But last year had nothing going by the same logic. The top games were sports games and old games. This year we at least have Destiny 2 instead of Taken king or collection of Destiny. And LE bundles tend to just add to sales rather then replace sales.
Edit: Oh and 160k August last year became 191k this year. If we use the same % increase then we get 340k for PS4, but even I am not that optimistic. XB1 will definitely be down because it had a lot going for it last year and this year there is the XB1X.
PS4 had the slim model launch and a price drop to $299 in September 2016.
Did it help sales? IIRC the PS4 slim flopped. And even it it did help sales it was only available for half the month, which means the other half had mediocre August like sales. All the Septembers for PS4 with a new Destiny were superior to it.
Also this article makes it seem like the PS4 was already $299 or similar value. https://arstechnica.com/gaming/2016/09/ps4-slim-review-2/