I personally think PS4 will go past 100M, but I'm not sure it clears 110M.
Thats almost lol worthy.
Next year around this time itll be 95-98M shipped (end of Q1 in 2019).
PS5 isnt comeing until november 2020 imo, thats like ~19 months of sales (after the 95m-98m mark).
So its basically 100% sure thing, it ll cross 110M. (By the time PS5 launches it ll be 115-120M)
I think it ends up in the 130-140M range, by the time of 2025 or so, if Sony makes a 7nm Super Slim for 149$.
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249
Bumb in 2021: http://gamrconnect.vgchartz.com/post.php?id=9047071