There is no sign of the PS4 slowing down. The line up alone this year i's going to make sure of that. The console almost sold half a million units in Japan this year. And the PS4 hasn't even hit the $200 mark. When it does the PS4 is going to sell even faster.
Its certainly doing great but i really believe its going to start slowing down this year, probably back in the 2015/2016 range of 17-18 million.
You're right that this year's lineup is great but that doesnt mean sales will increase. In order for a game to be a massive system seller in a consoles 5th year, it needs to be a type of game that attracts an audience that isnt already on the system.
I dont see that with most of the big games this year outside of MH in Japan which is why its up so much so far but Q2-Q4 will be another story.
A $100 price cut to $199/299 for Slim/Pro would give it potential to grow YOY but im thinking an official cut of $50 with an extra $50 over the holidays is more likely this year.
2018 will be a great year for PS4 hardware & software sales but i think this is the year it starts to slow down.
When the herd loses its way, the shepard must kill the bull that leads them astray.