I think he legitimately gave up on finishing the series a long time ago. Painted himself into a literary corner and rather then rely on some deus ex machina to

I think he legitimately gave up on finishing the series a long time ago. Painted himself into a literary corner and rather then rely on some deus ex machina to sweep away the problems is choosing to never finish. I guess the real lesson: unless their name is Brandon Sanderson, do not start a partially completed series.