I think it has been since Kinect Adventures in 2010. I don't know if Xbox 360 would've crossed 70 million units without the success of Kinect.
Halo: Combat Evolved was a killer app for a first console, despite Xbox falling well behind PS2.
Halo 3 was a killer app, so is Kinect Adventures. I don't know if there have ever been any other Microsoft titles that have been killer apps for Xbox. Shoot, there probably hasn't even been killer app third-party games even since 360 in general.
Lifetime Sales Predictions
Switch: 159 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million, then 161 million)
PS5: 116 million (was 105 million, then 115 million, then 122 million)
Xbox Series X/S: 38 million (was 60 million, then 67 million, then 57 million. then 48 million. then 40 million)
Switch 2: 120 million (was 116 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
