Where does this end? Unless the hero's dead by the end of the work, there's going to be some uncertainty about his ultimate fate.
I see where DG wants to draw the line. I don't see where you're drawing it
Here's a good rule of thumb a Writing professor once told me-
If the end of any book, movie, chapter, episode or otherwise leaves you asking the question- "Oh snap! What happened to 'x'!?" (where 'x' is someone of particular importance to the audience, generally, but not necessarily, the protagonist), and the only legitimate answer you can come up with is "Probably nothing good," it's a cliffhanger.
Some examples-
"Oh snap! What happened to Doc Brown!?" -Back to the Future 2.
"Oh snap! What happened to Han Solo!?" -The Empire Strikes Back.
"Oh snap! What happened to Neo!?" -The Matrix Reloaded
"Oh snap! What happened to Captain Jack!?" -Pirates of the Caribbean 2
"Oh snap! What happened to Hawke and the Warden!?" -Dragon Age 2
(I promise it's a coincidence that all of them are the second installments in a series.) This method won't catch every type of cliffhanger ending, but if it applies, it almost certainly is one.