Genesis was a surprise smash hit…then Sega just spewed out consoles; 32x, Sega CD, mega drive, Saturn… Probably more. In that same time span Nintendo released…N64.
Nintendo had the SNES, N64, N64 DD, GameBoy Pocket, Colour, Advance, etc.
Build a winner, milk it. Release another winner right as the previous one is winding down. Nintendo has mastered that formula.
Every other generation; they’ve not been consistent in their success. The N64 did quite well, the GameCube was okay, the Wii did great, the Wii U did not, the Switch has done very well, I reckon the next won’t.