Cool I get to being an idiot online, my favorite thing!
The decline is a harsher decline in attendance than expected without increases in guest spending. There's a point where the savings of having fewer people in the park (wear and tear, running fewer trains to save spending on maintenance, fewer CMs to corral and interact with guests, etc) but have each guest spending more would increase profits more than simply adding more and more capacity.
Problem is they are finding their hotels aren't being filled. Then they find out guests aren't spending more they're just factoring higher hotel and ticket prices into a fixed budget.
Fixing this in the short term would require Disney to go back to mass discounts, offer creative bundles, or stay course and not raise prices over the next few years. To halt the decline overall they need to do what Universal is doing: attractions and new experiences year over year over year.
That being said WDW is sort of "too big to fail", it won't just close down or be in risk of collapse, someone will come in to buy it. My personal theory is the cost cutting and WDI layoffs are the start of a selling of the parks, probably to a Chinese company.
Right now? They don't have the long term ability to counter this. What they need is a whole management overhaul and to reassess the definitions of success for managers and VPs.
Disney has name, a retirement age demographic that loves their product and has retirement money to take themselves and grandkids, and capacity. Capacity is key; IOA tops around 35k and USF in the high 40s while MK goes into the 70s and 80s.
What I see Universal coming is a very strong second place in a new "long weekend" vacation strategy for Orlando. MK won't ever lose first place in my mind, but everything below that is up for grabs.
Lets cover each park
MK- Problem is the other parks, nothing drives guests to them. MK has the classics, the characters, and the name. A strong three other parks is what MK needs.
Epcot- Attractions wise they need new attractions in WS to drive guests there earlier and a complete new slate of attractions in Future World. The nighttime show is good but old, a new one is needed once newer offerings open around the resort. Disney needs to look at each restaurant and see what is pulling their weight and what isn't. Morocco needs a overhaul that keeps it authentic but adds an appeal to guests beyond "there are reservations open here". Mexico, Italy, France, UK, and Canada are popular so anything else needs to be re-evaluated. Start new in FW for food outside of Sunshine Seasons. Additionally a full visual overhaul to Future World needs to occur as the last one it received was 16 YEARS ago.
DHS- Once Star Wars and Toy Story open the park still has many issues: a bad nighttime show, several out dated attractions and shows, a lackluster main entry area, and the whole Animation Courtyard fiasco. Assuming the Mickey attraction comes (sort of hope this goes into Animation Courtyard) Disney needs to refresh all the existing shows. BatB and LM can remain the same with updated effects, pacing, sets, costumes, and choreography. Fantasmic, IJ, and Disney Jr can be upgraded with new scenes and technology to better execute it's goals. Food needs a major refresh, especially ABC Commissary. There is no reason why Monster Sound is still empty.
DAK- Wait and see, can't tell as more than half of the planned refresh hasn't debuted yet. Besides RoL and Avatar Disney needs to look at Rafiki's Planet Watch for replacement. Dinoland needs help in general. I love Finding Nemo but the attraction needs a technology upgrade badly.
Anyway that's my dumb thoughts.