Maybe he is just a lucky idiot
Randomly today I remembered this series after a decade and was like oh that third book must be out. I go look and nope. I remember 10+ years ago he was making bullshit excuses about his family or whatever. Maybe it’s time to admit he’s not a good author and he just got lucky with the first two books? It doesn’t make the books bad, it just means he can not reproduce his luck and make the third book any good because he sucks as an author. He’s the renaissance fair know it all book nerd who thinks he’s actually good and now he can’t produce when he needs to. 10+ years and nothing…at this point I’d guess it never releases or it’s going to make the shitty game of thrones ending look like the best ending of all time.
Edit:
I guess it’s like this….you’ve got companies that dig for oil and have entire processes and plans, etc. to find oil. Then you have someone who gets lucky and finds oil in their backyard. It’s still oil and it’s still valuable even though it’s a lucky find, but expecting that lucky person to just go stumble on another load of oil is incredibly unlikely.