Why would Nintendo make another Console after so many failed attempts?

[GTAexpert]

Norris2k said:

Gammalad said:
NES sold well
SNES sold well
N64 was profitable
GCN was profitable
Wii sold well
Yeah lets just stop making hardware.

And by well, we mean extremely well most of the time. And we don't even count handled console.
Two reason more to stop, lets stop !

The OP isn't saying that Nintendo's handhelds should stop, just their consoles.