Also for Southern California and Arizona - this is an El Nino year and it may be that a lot of people decided it was going to be too wet/windy/cold for them. After some 5+ years of dryness, it is good to see the rain, but I suppose it isn't for everyone.
I do think there is a demographic change going on. We've been fulltimers for a number of years and one of the things I'm noticing is that parks are still catering events for those who went to high school before the 60s, or for those who think Country Music is the only thing available. Luckily we don't depend upon the park offerings in terms of entertainment and in a large metro area we find plenty to do, but it is sad that the management of the parks hasn't figured out that they might need to adjust a changing of the 'guard' so to speak.