I've never been to LUGNET, but I know that it's the largest LEGO site out there. Considering what everyone has said, I don't think EB has quite surpassed LUGNET in terms of popularity, but, if I managed to stumble my way over here, many, many others will do the same in the future.
As long as the staff stays motivated and the community stays polite, I think the site will continue to grow.