An interesting point to discuss, as I've anecdotally found that people dislike timeline updates - but this might a confirmation bias at work due to my personal distaste for them. Hmm... I've never really considered it before.
I guess it really depends if you are a fan of the novels and the rpg or just the rpg, because personally I find it neat that the novels actually do have an effect in the rpg and the story evolves like the Zhents imploding then rebuilding and the Shades invading.
In any case, I wouldn't mind a small timeline update for Eberron. A big part of the setting was the explicit understanding that it was taking place in a period of relative calm between two massive wars. Although I wouldn't want the next conflict to have started (too big a change), having Khorvaire creeping a bit closer to world war could be entertaining.
There are probably a couple of new or extended meta-plots that could be started or ramped up to make sure that everything is not too peaceful and boring. =;o)