This is a very interesting thread. As it stands, I cannot see Star Wars LCG being expanded into any other era, precisely because the core components are too closely enmeshed with the Classic Trilogy era. The Death Star Dial, as you mention, as well as the commit-to-the-Force cards, cement the period in Star Wars history this game takes place, and I can't see it going any further. Thematically, to make a game set in the Clone War era, you'd have to change the Vader/Luke Force cards - but to what? There are so many Jedi to choose from, and I can't really see Darth Sidious proving to be quite so dynamic as Vader in that pose. The Death Star dial too - to what?
Moving the other way, you still have the same problem. Vader dies at the end of RotJ, so the Dark Side's commit-to-the-Force card wouldn't sit right, thematically, and what do you change the Death Star dial to? An Eye of Palpatine dial? A Darksaber dial? It doesn't really fit. Using these core components as they have, they have kinda written themselves into a corner with the expandability of this game. However, this needn't be as big of a problem as I'm probably making it sound, as WEG produced reams of pages of Classic Trilogy lore that has enriched the galaxy. Perhaps they could expand into the very closely-related NR stuff, Truce at Bakura or whatever, maybe as far as the X-Wing novels. While it would be nice to see more affiliations introduced once the game has established itself, as in Cthulhu, I don't really think we'll see anything like this.
The problem, as I see it, with branching out a game that is firmly fixed in the Classic Trilogy era, the core set becomes obsolete. You will still need focus tokens, wound tokens, and shield tokens, but that is it, and these can be proxied. All of the cards are for the Classic Trilogy timeframe, the DS dial and the Force cards, they are all theme-specific. To produce new Force cards and a new dial of some description as part of some sort of deluxe expansion, means you can play this game without the core set, which undermines the basic premise of the game model.
I would love to see more eras, don't get me wrong! I just can't see us getting even very far into the New Republic, let alone the NJO. Thankfully, it is perfectly possible for us to see folks like Thrawn and Karrde, as there are stories featuring these guys set during the game's timeframe. I just don't expect us to see a Yuuzhan Vong or the Solo kids.
I do believe we'll see Clone Wars games, possibly even TOR or KOTOR games, but I don't expect to see them as part of this game. I don't see the prequel trilogy as a "perverted uncle" whatsoever. As a fan of the classic trilogy, I do have issues with the prequel trilogy, and a lot of the material that has been spouted off of it since, but I think it's wrong to say that producing a game set in this era would "piss off" the fanbase. Remember, a huge portion of the fanbase has grown up with the prequels as "their trilogy", and will have plenty of fond memories of those podracing scenes as we older fans think back on the trench run. FFG would be insane to forgo this demographic, as - like it or not - The Clone Wars cartoon series is Star Wars at this current moment, and will be until 2015 with this promised new film.