Neither is GenCon, but Wyrd is there. Origins does have some mini events - Warhammer Fantasy, 40K and War Machine / Hordes are all there. WizKids used to be a huge sponsor before they imploded - I'm interested in seeing how they come back. Even as much as it has shrunk from a few years ago, I think it is still the second largest gaming convention in the US.
I got into miniature games 10 years ago because of all the cool minis I used to see at Origins, I finally decided I just had to start playing some of those games.
While Adepticon (my first time there this past weekend) was cool, it was much more of a set of co-located tournaments than a convention.
Even if Wyrd can't justify a booth there because of the economy, it is still a shame that someone isn't running at least some demo events or a tournament there.