I can see where you're coming from, but I disagree on this point. Since ARR's release there have been a number of completely new features.
- Beast Tribe Daily Quest
- Treasure Maps
- Frontlines/Wolves Den
- Player Housing/Gardening
- New Jobs
- Sightseeing
- The Hunt
- Triple Triad
- Chocobo Racing/Breeding
- Collectables
- Free Company Crafting/Airship Voyages
Lots of these fill up my time way more than the standard dungeons, raids, and quests.
However, only a few of these new systems are combat based. I would agree that new battle content would do much to spice up the game.