This is more hearsay than research, but from what I gather
he started the books, got a contract for 13 books, thinking
they would be maybe a trilogy and then he'd have steady work
for a while. Eye of the world took off and they insisted on
all 13 being wheel of time. If you notice the end of the third
could easily have been the whole end point with just a little
change. I assume it was originally meant to, so then he had
to drag the story out to meet the contract. While his wife and
kid have all the notes and instructions from him on how to proceed
on book 12. I hate to say it, but 12 might not be then 'end' but they'll kind of make it the end if you get me. I'm not going to
expect much, then no matter how crappy it turns out, I'll be okay
with it. *rofl*