My opinion on the whole PS4/PS5 thing. PS5 is a 2020 release with PS4 peaking worldwide in 2018. A 2018 peak was something I never expected to happen at the beginning of the gen but it seems morel likely now.
A 2019 PS5 launch to me makes only slightly more sense than a 2018 launch. Why would Sony launch a new console just a year after a gigantic wave of quality exclusives? Even if PS5 has BC (I think it will) it still doesn't make a lot of sense as PS5 is bound to have very little in the 1st party offering for the first year or two because everything is scheduled for a PS4 launch. Also a console launch should come out like 2-3 years after the peak year.
While waiting for the June NPD, I'm predicating that in the US, PS4 H2 2017 is down ~5% from 2H 2016 resulting in a ~2% drop YoY or ~100K units less. Basically flat and I'm assuming any price drop stays in Black Friday and Christmas sales. The actual price drop to $249/$349 (Pro) won't happen until Spring 2018, along side releases like God of War and Spider Man. I'm also predicting that the 1TB SKU becomes the new $249 SKU with bundles at the same time. With that, I can see 2018 increase by ~10% YoY.
On a worldwide scale, I think the same will be true and after 2018 PS4 sales should slow if Sony doesn't do something like a digital only PS4. A price drop to $199 will only really ensure PS4 doesn't crater after the peak and after PS5 comes out.
With a 2020 launch I also expect XB4 to be a 2021 launch. Don't think MS will get new hardware out in 3 years unless it's a $599 device.
And just to add, while this isn't a tech thread, my prediction for a 2020 PS5 launch is something like 24GB of GDDR6 RAM, ~10-12TF, a 3GHz CPU, a 2TB HDD at $399.
Also something else I was thinking of but forgot to mention was PSVR 2. What is the VR roadmap looking like for successors to PSVR, Oculus, and Vive? I'm thinking Sony wants PS5 and VR 2 to come out at the same time and to make sure there is enough software and the tech is good, that might warrant a 2020 launch.