While there apparently won't be anymore new Skyrim DLC to sink your teeth into, you shouldn't fret! Because there's still those three other DLC packs for you to extend your game's life with. What's that? They're too costly for you to consider purchasing them? Well not anymore.
Gamestop is running a sale where all of Skyrim's PC DLC is 50% off. Dragonborn and Dawnguard are both only $9.99 each while the Hearthfire add-on pack is a measly $2.50! Of course the downside is that you have to download Gamestop's less than stellar download app, but since The Elder Scrolls V: Skyrim is a Steamworks game, you should be able to enter your serial code into Steam to redeem your content on a platform you actually use without issue.
You can view the entire sale page at the link below.