There are three ways that people have gotten to the point where they have nothing left to do:
1. They most unlikely is that they have the free time to actually do everything in the game.
2. They are Legacy Players from 1.0 that have previously completed a large amount of the content and truely have done everything.
3. The most common is that their are players who are only interested in a very small portion of what the game offers, and thus have completed everything that pertains to their specific interests.

I really enjoy almost all aspects of this game, so there is a lot of content for me to complete. However their are people that do not want to craft and gather. Their are people that do not want to explore or read text for story purposes. That is their decision. However, if they complain, it is our decision and the developers decision to ignore them if we so choose.

The bottom line is, if you like the game play it, if you don't unsubscribe and go play something else.