I think PS4 will have a minor drop, while the Switch gets a small boost.
My prediction (japan 2019)
Switch = ~3,800,000
PS4 = ~1,600,00
also think this will be the Nintendo Switch's Peak year, ei after 2019, sales will slow down abit for it.
Edit: Near Q3 I also expect the Switch will have passed the PS4 in total sales, in japan.
Last edited by JRPGfan - on 10 January 2019