There is also some level of audience concentration here. Disney does not view itself as having a problem attracting guests. As with many companies, when you have that luxury, you go after your top performing group. MK is the main star, and they want people who love current IPs they can merchandise. They stay in the hotels more, buy DVC more, buy merch more and don't get as upset when things change. They want Disney (franchise) fans who love their characters, food, etc. more than Disney Parks fans. That's not meant as an attack on anyone at all. There is a very real phenomenon that "people go to Disney Parks to see Disney characters" in the GP. It is also very, very true that's not at all what got the Parks to the fandom they have today. But, Disney is capitalizing on that, especially for MK.
I do think there are some valid criticisms of that approach, and it may prove short sighted in the long-run (especially as Disney struggles to create anything new). But, I think it's difficult to argue that audience focusing isn't part of this and other decisions happening in the company today as it relates to the Parks.