Will PS4 pass Wii? And how much do will it need to sell to accomplish it?

[JRPGfan]

The problem the Wii had, was its year 6,7,8,9,10 the sales of it dropped off a cliff.
Playstations lose wind in their sails too overtime, but it ll be a less steep decline.

2017: 18,5m
2018: 17m
2019: 15m
2020: 12m  (PS5 releases near end of this year)
2021: 8m
2022: 4m

= lifetime : ~128m