Dude, that's an awesome fucking idea! The Yuuzhan Vong have hardly even been heard of but there's so much good shit out there about them, and the days after the movies. I think if they were in a game it'd make people more interested in that time period. Hell, they've made games about shit before the movies, why not after them?
And the nice thing about the "vong era" is that they are pretty free as far as story goes. They could invent a new squadron of New Republic soldiers and have them doing their own campaign against the vong without having to deal with the invents of the book.
It was a big war, and theres plenty of ground that hasnt been covered.