Because Blu-ray never supplanted DVD. Yeah, there is a lot of VHS content that never even made it to DVD. But it would be more likely to make it to DVD than VHS.
Blu-ray is not niche, but it's not the earth-shattering success of VHS and DVD. Ultra HD Blu-ray is niche. It's more mainstream than Laserdisc and some other formats, but it will never reach Blu-ray levels, let alone VHS or DVD.
Digital distribution seems to be the mass market successor to DVD.
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: 122 million (was 105 million, then 115 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
