I've got to get back to being a good host shortly, so I don't have the time to track this down on Google, but who the heck is left in the Disney "family"? Isn't it just a gaggle of grandchildren who are now quite elderly themselves? Plus whatever great and great-great grandchildren from the Miller side of the family that were born decades after Walt passed away?
Do any of them have any legal standing to determine what happens operationally in Disneyland? I doubt it. After Eisner took over for Ron Miller over 40 years ago, I don't think even Walt's two daughters had any legal standing on that sort of thing.
The elderly grandchildren, or middle aged great-grandchildren, can certainly voice their opinion along with the rest of us here on this forum about this artistic decision. But I can't imagine anyone from Disney's legal department has to run anything past any of those surviving extended family members on a park operations decision like this.
In short, the great-grandkids may have some Disney stock in their portfolios gifted to them by Mrs. Disney when she passed away 30 years ago. Otherwise, their opinion has about the same weight as our opinions do on how Disney runs its theme parks now. Which as we've seen at D23 Expo, those opinions mean very, very little to the current executive team.