Points well taken. And let me say that in retrospect, "not insightful" was a poor choice of words to express "I disagree," so I hope you weren't offended. I know I get sick of reading that kind of haughtiness on game forums, and I can only imagine that feeling is magnified for you.
Obviously "not now" is not the same as "not ever," but I'm not sure the drama/games analogy holds up. Plays have always been a form of mass entertainment, and even the most crude of, say, Plautus' works were considered "low comedy" but were enjoyed by a "high" audience. My point is to say that because of the nature of the medium, I'm not sure games will evolve the same way.
I may have misunderstood your original post, or maybe I just have NWN2 on the brain, but I understood your argument to be about fantasy RPGs. FPS games in general and military-style games in particular have a much broader audience - you're no longer talking about us nerds. Maybe you can make that work, and make it sell, but it's a fine line to walk. What I meant by saying I wouldn't play that sort of game, is that I come to play, not to be preached at. To go back to your parallel, plays were never (go all the way back to Aristophanes) NOT about moral lessons, and their descendent movies carry the same weight. With games, you're not just talking about complicating the same general themes, you're talking about a complete revolution in what's acceptable content for the medium. I'm not sure A Doll's House falls into that category - I would say it's a moral lesson adapted for an apathetic postmodern society, but no less of a moral lesson. Creating a "scandal" is no indicator - Aristophanes' "The Clouds" may have gotten Socrates whacked. Portraying a "realistic" environment maybe to a greater depth, but I'm not convinced that makes a story revolutionary. The scandal from Ibsen's work came from the position it took on the theme issue, not the general theme it picked.
As for topics being "tired," I think sanctity and diabolism in the Early Modern World would be slightly more obscure than a blanket statement about evil corporations. Forget law students, anyone who reads the newspaper is buffeted with stories on poverty and corporate greed. To make myself clear, I in no way specialize in those areas, and I would have said the same things about them before law school.
Still, your point may stand that "most people" don't see that. Most people don't read the newspaper or Time magazine, or care to. I would guess, and you'd know better than I, that fantasy RPG players on average are more educated than the general public on average. FPS players, or however you classify Splinter Cell type games, probably not.
I'm not familiar with the specific games you mention, so I can't really speak to that except in very general terms. I still believe that, games being games, tackling a political issue in any kind of depth will be either boring, or missed/ignored in passing, save perhaps a few very specific issues (but really, what can you say about terrorism or genocide in a FPS type game without being a cliche?). Games are, I suppose, becoming more mainstream, but (speaking only from personal experience) most people have no interest in them. If that changes, maybe the content can change.
I'm not so confident it can work the other way (i.e. can't see non-gamers playing games because of the strong themes) because unfortunately, to serious people who place value on that kind of debate, there is often a stigma attached to the PC/console game media. Take law students - a class of 120 people (myself excluded) laughed at one poor guy who, in passing, admitted to playing Age of Empires in high school. That stigma may change, but I doubt it.