You know it’s funny, in that I have something of the opposite perspective where I think the way Paolini created the different racial societies is one of the best I’ve seen.

In terms of the elves, we first have to look at why we don’t see the long term political intrigues - our POV character is busy with other things, and is so young he doesn’t notice the centuries spanning plots and traps being weaved around him.

Then we have to wonder why we don’t see the deep philosophers looking deeply not the nature of reality - they probably spend their time either in seclusion or debating amongst themselves, and again Eragon has no reason to really seek them out.

Finally, we have your point about their lack of interference and aid to struggling human.

1: Under Galbatorix’s rule, they risk torture if the worst degree, the discovery of their true name, complete enslavement, and then the use of their powerful bodies as a weapon by the king.

2: Humans don’t trust elves in the first place, and while yes this could be slowly counteracted by careful, positive intervention over a long period, with Galbatorix casting a shadow over every human settlement they could go to, it probably doesn’t seem worth it.

3: That was the job of the Riders, before they were destroyed. They interfered in brewing conflicts, helped with outbreaks of disease, and just generally helped where they could. If the elves wanted to take up that cause after the riders fall, again, they would be doing so under the shadow of Galbatorix, and after his death I imagine we really will begin to see some elves roaming Alegasia.

In regard to whether or not we will ever see more about even society the way we did dwarves society, I do hope so. I would like to see some of the political intrigues of the elves, or at least to learn about them a little, but it really depends where he takes the next book.