I don't get why you think toy story would be pushed back to 2019 at DHS. That doesn't make any sense right now.
Christine McCarthy (cfo disney) spoke at Citi Internet, Media & Telecommunications Conference on thursday and it really changed my view in what disney. from a spending money standpoint, is doing in the theme parks. The short is that cars equalized the 2 anaheim parks where it made it more of a 50/50 split attendance wise that has remained very close instead of california adventure getting 25% or less of the visitors. She also said they are viewing pandora as the same thing that will help equalize out animal kingdom in the same staying power way.
Looking at the other announcements, star wars I think is the equalizer for hollywood and the transformation kick off to redo that park to no longer be backstage themed.. I have a feeling that toy story the movie slipping in it's release date might have been a project we wouldn't have heard about yet because it could have been hidden as possibly part of the star wars construction giving them more news in future years to excite us during long term construction. I think they are going to let construction slow down (where it makes sense to allow for star wars to stay on track) but still open in time for people to get excited abotu the movie and want to visit and piggy back on movie marketing which they can do for cheaper and get people to think about the movie and visiting WDW at the same time..
So whatever is about to happen at epcot I think is to both keep future world busy the full day, get more room for food festivals to be larger (aka less crowded at the same time) and they need something to equalize more families from all crowding MK the most. MK, in my opinion and I hate this, having no night parade has spread out the crowd so there is no dead spots at night and the fireworks before projection has more people leaving the park earlier allowing an earlier park close and saving operating costs. The holiday week we really saw what this did where rides were horrible time wise, but the crowd stayed spread out so it didn't feel as crowded as past years.
Toy story could help this but it's not going to have the new fan draw that star wars will add while equalizing the crowd between parks. If I was signing the checks, star wars is more important than toy story for the new fan draw but toy story timed to be ready for you to experience while the movie has you excited is a way to slow down spending for a year to keep profits up but still ride the movie wave. It's only recently that the release date slipped and why I think the big picture might have toy story land slowing down. They aren't going to slow it down in certain areas, it's cheaper to get the crane work done together and the overlapping work force doing 2 lands, but when it comes to finishing touches that's when I think we'll see the radical change in schedule happen to push its opening a year. But if the goal is wall street happy and spread out spending with shanghai pulling the division down then spending more money but delaying when you write those checks and pandora brings in more bacon will help that. they also need time to revamp the parking lot situation, toy + stars close to each other is going to make a traffic nightmare and parking is going to a real problem.
It's all confusing but I think frozen showing that a movie will bring in park attendance, cars spreading out the crowd so you can fit more without expanding too much where you don't want to put the money if you can avoid that. Disney is really looking at how they change and add things to the parks is different than in the past which is why I think what we know as classic disney timelines is wrong now... They are using their old formula of events and using the AP holders to get attendance and spending to stay up is how they are going to hold us off. This weekends food festival with arts is brilliant. Somethign new, something different every week and on the days the locals can pack the place and want to spend money...
edit: look at springs, that place is bustling with people looking to dine and spend money. brilliant work to spread out the crowd, bring more local dining and really up the revenue in ways I didnt' see coming. I thought i was for an international crowd to not go off property to shop and it's equally about getting the locals to come in and spend money and time just in different ways (food vs merch).