Incorrect, you can achieve 100%, but it is unlikely. However you must change your lodging model, and room blocking methods. We are seeing rumors of this with the star wars boutique hotel property.
The problem is that they try to stay flexible, you can check in or out any day. That leaves the holes. Suddenly, they can start having mandatory 4 day stays on certain deals, ....and the fine print is that you must arrive on a Wednesday, Fridays or Sundays.....and so on. A bit like a cruise ship. The ski industry has done this for a while. You can guarantee 100% occupancy, or at least 100% paid reservation status(including no-show revenue). It reduces housekeeping costs as you can better predict the high turnover days.
People alter their vacation timing based upon flight costs. Disney can take a page out of that book and incentivize folks to check in on certain days, to better fill the beds. It is coming, and many non disney resorts already put this into practice. The key is you need to have a fairly captive audience to do it, and Disney qualifies.