The end of official new content can actually be a good thing if you think about it. Modders no longer have to worry about future changes breaking their mods, so they're free to improve more aspects of the game.
I agree that the volume of content added since release is quite impressive. I find it ridiculous that anyone would stop their feet and demand more, especially given the game's low price point.
In the future I hope to see more mods which improve the world generation process. There's a lot of room for cool stuff there - I'd love to dive into it myself if I had time.