Dek Rollins said:
It’s a direct sequel to the Wii, hence the use of that name. Only it’s really a beast of its own even then.

Since you added this bit in later, the Wii is basically a GameCube with motion controls. There is really little difference hardware-wise. If the GameCube sold as well as the Wii did, they’d have definitely capitalized on the name.

But the N64 didn’t do well either.

The N64 was the beginning of Nintendo’s problems with third-parties, and holds the distinction of being the first console where they were no longer the undisputed king of the business. But even still, this was a world where Sega was doing even worse, and before the Xbox. The N64 did well at the time given its problems.