They are definately NOT going to kill off Hook. Unless I see a video of the writers saying that ‘Hook will be killed off’ then I don’t believe anything other ‘posters’ say about major events in the show, such as killing off characters. I have never seen Lost, but I know enough to know that Once Upon a Time has a very different plot, and therefore the writers would probably not go in the same direction as their previous show. These writers aren’t stupid, they know that the fans LOVE Hook, so they would never kill off Hook, especially with the chemistry Colin has with Jennifer.
Just because people died on this show who were ‘hunks’ doesn’t mean Hook will die.
Also the writers themselves ship Hook and Emma, and they love Colins’ portrayal of Captain Hook. The writers go by not only their own ideas, but also the reactions that the fans have.
I agree that the ratings will most likely go down if Hook dies, but that does not necessarily mean it will happen. I know many people think that Rumple will kill Hook or Hook will be killed while getting his revenge. However my theory is that because Cora is coming to town, she will be the main villian. Therefore all storybrooke residents, including Hook and Rumple may need to team up to take her down. So if the writers take a similar path to this (which i hope they will) Hook won’t be killed.
So at the end of the day, its all about the money. The more ratings the show gets, the more money the wirters get. So i highly doubt they will kill Hook because since Hook has been introduced, the ratings have sky rocketed!