I think he's thinking too small. Looking back at videogames in Japan, we can see that they've provided the impetus for musicians and voice actors/actresses careers (of course some seiyuu double as singers, most notably Megumi Hayashibara) and have been the source of anime series, comic books, and even movies. Some of this has happened Stateside, but not to the extent that it has in Japan, and not nearly as well. I mean, there have been half a dozen movies done by Hollywood based on video games, and none of them are going to make anyone forget Charlie's Angels, much less Full Metal Jacket.
We're seeing voice actors & actresses treated as minor stars and honored guests at conventions all across America. Some of them are pretty fine looking, and who's to say we won't see Carrie Savage or Monica Rial on the big or small screen someday soon? Is it that unrealistic to think that some producer won't take a shot at Halo: The Series? I think it could happen, and quite possibly in the next five years.