I have a slightly different view of this.
What really matters is that we get attractions that are immersive, compelling, creative, innovative, entertaining, and that can be enjoyed many times without getting stale.
Those attractions should be designed by artists (painters, sculptors, illustrators, model builders, designers), writers, engineers, architects, and other highly skilled individuals who follow in the footsteps of the great Imagineers of the 1950s and 1960s.
However, that doesn't mean that the artists and other skilled people must all have "The Walt Disney Company" on their paycheck statements. Disney has always used contractors to some degree in the past. Today there are a number of companies that have the skills to produce turn-key park attractions.
When it comes to Disney movies, I care about how good the movie is not whether or not it was produced in-house. Along the same lines, if a company like BRC Imagination Arts were to create an "E" Ticket attraction in the tradition of the great rides of the 1960s, I'd be happy.
The decisions about how to enhance the Disney parks how to reinvest the profits from the parks should be made by executives with the instinct and insight that Walt Disney possessed. (They should have it easier today because Walt and his staff showed the way.)
But this is where the problem is! Too often, the business decisions have been along the lines of, "Replace an attraction that doesn't drive merchandise sales with a relatively cheap Winnie the Pooh attraction that empties into a gift shop." That's not how Walt Disney was thinking during
Disneyland's first decade.
Before someone says that Disney is a business and needs to make decisions based on sound business judgement, let me point out that people have been spending money visiting Disney parks and resorts because of the great attractions such as the Haunted Mansion and Pirates which were great business decisions that were made four decades ago.