110-120, I'll say 115 million (just shy of PS4).
Admittedly, PS6 could take until 2028 which could help PS5.
And while Switch (and its upcoming successor) are not in direct competition with Xbox and PlayStation, they will surely have some effect. Wii U was a flop, and Switch (IIRC) didn't start outselling PS4 in a given year until at least 2018, if not 2019.
Xbox Series X/S and how it will affect PS5 is interesting. Xbox Series X/S used to be outpacing Xbox One, but is now slightly behind in the time spans compared. PS5 being widely available for nearly a year now seems like a problem for Xbox. Series S used to be far easier to find than an PS5, but that doesn't seem like a factor anymore.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima
