John and Dave Ingram have it nailed. You have to stop looking at this as a top-down thing, it's bottom-up. If there's no attendance at the qualifiers, there's no use for a championship. The rest falls from there.
Having said that, there is no magic formula to this. USSA doesn't actually run anything, local volunteers do. So, don't expect that even if we could we find 10,000 cat sailors to join USSA, there will be a USSA staff member to set up and run qualifiers around the country.
The closest thing we can get to "easy" is local people to work with a YC to host and run the events, as a fee-for-service deal. Those are never popular primarily because of the expense, and sometimes a lack of knowledge from the YCs on how to manage events that make cat sailors happy.
Mike