You are correct. However, let's break down the numbers from the TEA report available at the link below. (I am not a business analyst and math tends to make me break out into hives. So if anyone here is better at analyzing data, please feel free to chime in.)
http://www.teaconnect.org/images/files/TEA_235_103719_170601.pdf
Attendance
was up overall in Orlando in 2016. 77,489,000 in 2016 compared to 74,706,000 in 2015.
What is significant isn't the relatively small drop in attendance figures for the Disney parks in 2016. What is significant is the shift in market share. In 2015, Disney had 72.3% of the market share in Orlando with Universal having 21.3% and SeaWorld having 6.4%. If we look at the 2016 numbers, however, Disney slips to 69.3%, Universal grows to 24.9% and SeaWorld dips to 5.6%. That's a loss of market share to Universal of 3%. 2,324,670 attendees is a substantial number of admissions to lose.
Mind you, the increasing costs of attending a Disney park in 2016 made up for the loss in attendance. Still, I'm sure Disney is concerned about the attendance report as it could hurt their stock should the trend continue.