Currently Online 
If they are as aggressive as Sony as getting third-party support, they could've been very successful. At least outside of Japan, that is. I'm skeptical they could've made a splash in Japan.
If they had any online play at all, it would be very primitive. More primitive than Dreamcast or the Xbox we got in 2001.
Globally, they outsell Saturn but finish behind Saturn in Japan.
Even with more of a market split, I still don't see Nintendo winning. People would gravitate towards PlayStation or Xbox for third-party games.
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
