People wouldn't do more than half of what you're suggesting. Look at the Diadem. It died partially because people are not interested in a massive zone with annoying trash mobs and areas they have to explore. The current raid scene is popular because of its simplicity. Adding story and whatever else will only push them away. This is why we have Normal and Extreme/Savage. Those only looking for story have the 'easier' option while others have a challenge. If you question actual raiders, I suspect very few will complain beyond asking for more fights.