There are many, many reasons for the decrease in crowds at Disney World
1. YES, the spike in price for the tickets is a mayor concern. Not only they have raised the prices extremely high, but they also keep adding "NEW" types of tickets . For example: my husband and I have been purchasing annual passes for the last 15 years. On 2016 Disney came up with Premium Plus Annual Passes, we thought ok, Premium Plus must mean a all inclusive (theme parks, water parks, hopper, no blockouts), well it wasn't an all inclusive, it just meant hopper + no blockout dates. They increased the cost and changed the name, THAT'S ALL! When we made the observation to our cashier, she told us: oh! But now you guys get a separate entrance exclusive for Annual Pass Holders. Also Fl. Residents are not getting the same discounts as before, if a person is a Fl. Resident and wants to visit Disney anytime, they are recomended to purchase an Annual Pass instead of a Fl. Resident discount.
2. Disney keeps closing the parks for SPECIAL TICKETED EVENTS. NOT SO SCARY HALLOWEEN PARTY, STAR WARS EVENTS, MICKEY'S VERY MERRY CHRISTMAS all require a separate admission cost, and its not $10 per person.
3. Popular attractions are either on refurbishment or closed all together. Many Disney fans are emotionally invested in some of the rides. They want to see that special ride from their childhood and when they get to the parks, are not there anymore.
A large part of the attendance of Disney come from guests that have been there before, but are not regular visitors. In many cases, they haven't been back in years and some bring their children and grandkids to experience the same magic they saw years before, but when they arrive, its not there anymore. Its awful to experience deception at the HAPPIEST PLACE ON EARTH.
4. Disney's Vacation Club is taking no hostages. Every single hotel in the monorail route HAS a DVC. The less expensive of the three is The Contemporary Resort and the leveled an entire building to built The Bay Lake Tower. At this point, having a vacation at a Disney World Resort can only be afford by the wealthy. Even the All Star Resorts are now chaging 1/3 more for a room near the main building + they are offering a semi-suite with a kitchenette for the same price The Contemporary had for a garden view room 4 years ago.
5. The "cast members" (employees) are rudder than they used to be. Not so long ago ( I mean 5 years ago) "cast members" would go out of their way to please and help guests. *REMEMBER, I HAVE BEEN DOING THIS FOR THE LAST 17 YEARS; It seems once the credit card has been approved, they don't have to work for your likings. I used to complaint to people who asked me: are you visiting Universal Studios this year? I said, No! Universal Studios crowds and employees are not courteous. Now that is the case with most of Disney employees. My last trip was a month ago, I am a DVC Member, everytime we entered through the lobby someone would say "Welcome Home", on my last vacation, I only heard it once in 17 days.
6. Complete disregard for the DISABLED! I think this one is the one that really makes my blood boil. Disney used to have a caring way to accommodate disabled guests, but again, about 5 years ago, they stripped guests in need of special assistance. Now they implemented the My Disney App and the disabled fell through the cracks. They are handing out return times for whatever time the standby line time is. As if to un explicitly say, "hey you either do the stand by line or stit down and wait an hour and a half until everyone in the line is in". GEEZ, thanks! Isn't it bad enough that I'm in pain or sick or hurt? and still came to Disney so you cam treat me like dirt!
Anyway, there are many reasons for diminished attendance at Disney Parks, the ones I mentioned are just a few.