Umm.... Pardon me, but why exactly would attendance being down in the parks be a bad thing? Disney has raised ticket prices recently, and has been increasing revenue from having more and more additional ticketed events such as firework dessert parties and other activities (tours, Bibbidi Bobbidi Boutique, etc.)
I'm currently at Disney World and I have never seen the parks this crowded before. If you look at past statistics, Magic Kingdom in 2016 had an average daily attendance of approximately 56,000 visitors and in 2011 had approximately 47,000. I know that those are not precise numbers and it varies, but there are no longer any quiet times of year.
Unless attendance suddenly drops to post-9/11 levels, I don't think the Mouse has anything to worry about.