Quixit
Reputable
And unlike Nintendo, SEGA was in a rough financial state when they dropped out of the hardware business. Nintendo is still a healthy company with billions of dollars on hand, and they can clearly afford to continue making hardware.
Nintendo is getting a lot of flak from their shareholders right now for under-performing, they're not that far off from the Sega situation right now. If the NX isn't a big hit they'll likely have no choice. The only reason the Wii U exists is that the Wii was such a big hit, now they're back where they were with the GameCube again.