The question is though, as a business decision, is it really wrong?
As Disney fans, we want something big. But if the general public gives validation to these "additions" with their wallet, it only makes business sense that Disney is going to continue these types of additions.
The only times they over-spend is when they think the ROI is going to be great. That was MM+, and well, they're probably still waiting for a ROI for that.
There's no need to build and build and build in your parks, at least in the corporate perspective, if your parks are racking in the guests. The parks haven't had dramatic drops in attendance figures, so there's no need for any dramatic additions. If an IP is famous, ie Frozen or Star Wars, we invest in the cheapest way possible, because we know regardless of what is offered, it will be popular. The less we spend, the greater the ROI.
I mean, it makes sense. Any good business would continue this type of thinking as long as the guests keep coming. I think our only hope for a dramatic shift is for Uni to continue its success. But the success needs to be more than Harry Potter, (ie third park) because clearly Disney doesn't do much to counter HP. The only was you'll see dramatic changes is if the guests are being pulled from the Disney parks. Anything short of that, and you'll continue to see the status quo.