Oh come on now. Even if you don't like AW 2, that wouldn't be fair to the fans of the game. The ending clearly was setting up a third installment of a grand finale, to have it all resolved in DLC length would be a letdown.
That's like saying in 1980, "I did not care for Empire Strikes Back, therefore Return of the Jedi should be 30 minutes long."
I do hope they continue Control as well, but they'd be foolish to wrap up Alan Wake in such a rushed manner. It's because they have such a dedicated fanbase that helps them keep going despite making such niche games, you don't bite the hand that feeds you but especially in this sort of situation.