1. DTD expansion - this is huge
2. Pandora expansion
3. Rivers of Light nighttime show
4. Night safaris
5. Capacity expansions everywhere in DAK for both food and merch
6. New TS restaurant in DAK
7. African Marketplace expansion for Harambe
8. The Hub expansion
9. New Jungle Cruise TS in Adventureland
10. Refurbs for Astro Orbiter, TTA, all of MSUSA, etc.
11. Soarin' expansion
12. Frozen addition/expansion in the Norway Pavilion
13. New additions coming to Innoventions East/West
14. Toy Story Midway Mania expansion
15. New DHS Flex Theater
16. The Polynesian Village Refurb
17. Wilderness Lodge Pool Refurb
18. Beach Club 20 month hard goods refurbishment
19. Grand Floridian 20 month hard goods refurbishment
20. Everyone's favorite enhancement - MM+
Not to mention, things recently completed:
21. New Fantasyland expansion (including 7DMT)
22. New bus load/unload for MK
23. GF DVC villas
24. New buses (including cool bendy busses)
25. Spice Road Table
26. Trattoria al Forno
27. Test Track redo
I hate quoting this whole list, but I think it is an important part of my thoughts. As you look over most of this list, very little of it relates to increased capacity for customers (to lessen waits for attractions). Most of it is geared towards increasing the number of people that can get into the parks without adding in-park capacity. Things like hotel improvements, new and larger buses, hub expansions, Maelstrom for Frozen ride trade, moving theaters from one place to another, etc. don't improve the customers experience, they simply get more customers into the parks.
The items that should increase capacity are still a year or more away (TSMM, Pandora, etc.) are still a year or more away. If you increase the park capacity by 10% between now and then, and only add 2% more attraction capacity, you aren't solving your problem, you are exacerbating it. Could they do more to make things better, absolutely! Was New Fantasyland helpful? To some extent, because some of it was an expansion, but you had to get rid of toontown to do it, which was simply trading one attraction for another. They probably did expand some capacity for MK with this one, but not a huge amount.
You have MK virtually busting at the seems for half the year. EPCOT is busting at the seems for some attractions, and completely empty for others. DHS doesn't even have many all day visitors any more, so you get your gate visit checked, but they don't really stay the whole day, so you are losing potential revenue by not having them stick around.
They need to start focusing on fixing one problem at a time - similar to what they did with Disney Springs. Spend 2 years and completely overhaul all of the issues with an area, not spending 2-5 years each on 20 different solutions. Sit down with all of the decision-makers and ask what is wrong in each park, now and 10 years down the road. Give the list to the Imagineers and give them 6 months to come up with a plan to solve 80%+ of those issues. Get the ball rolling on a plan instead of looking at the pile of money they keep pulling in. Once the pile starts to shrink, it will be hard to make it grow again. Learn from the mistakes of Kodak, early IBM, and to some extent Apple - you can't rest on your laurels once you have made one great product. You have to keep reinvesting in that product to keep it growing. When you get complacent is when things completely fall apart. Disney is starting to get complacent because they don't see the end of the money. Neither did the real estate market in 2007.