Walk by the FFG area on Friday and Saturday. It is almost a certainty that at any point there will be enough empty tables for 8 games of X-Wing.
I do not buy the space issue AT ALL. I've spent many hours in that area over the last few years and while it is often very busy, I can't think of there ever being a time they couldn't have fielded another 8 games of X-Wing in addition to all the other things going on.
Here's the thing, Gencon gets REAL pissy about using the tables for stuff you didn't say you were using the tables for. And this isn't something you can plan on, either.