Well, as I said, you do have non-leveling dungeons that are not tied to the main scenario. They are:

- Wanderer's Palace
- Amdapor Keep
- Pharos Sirius
- Lost City of Amdapor
- Hullbreaker Isle
- All the hard mode dungeons

Now, if you're talking about full party content (raids), then you might have a point. But I take that the Alexander raid on 3.0 will be a complete sidestory about goblins...