There are no bad ideas, only good ideas that fail because of a lack of or in resources applied to the idea. There are no bad ideas, only wrong ideas for that moment. There are no bad ideas, only bad implementations. There are no bad ideas, only lesser priorities. There are no bad ideas, only ideas in the wrong place or at the wrong time. There are no bad ideas, only lost opportunities.
Semantics, semantics, semantics.
Ok, so no bad ideas.
Including the idea that resources would be better spent elsewhere.
Including the idea that letting the marketing department drive creation is a suboptimal way to generate content.
Including the idea that a big corporation is not required to treat creative talent like "underlings", but does it by choice, and therefore could choose to treat them as valued members of a creative team that has tremendous resources at its disposal.
Or perhaps I do understand how things ran, and you simply disagree.
Certainly Walt's management style, in the context in which you are referring, would likely not have worked today. However, neither would the styles of the vast majority of managers from the 1920's to 1960's.
Management styles, like many things, are greatly influenced by the times. To assume that somebody born 50 or 100 or even 200 years later would have the same idea of what is acceptable behavior in business or social environments is absurd.
Whether you would have wanted to work for Walt is irrelevant. The question is did the creative talent of the day want to work for Walt? Of course not all did, as would be the case with anyone. But many did.
Retellings take many forms.
Yes, they do, and there are quite a few failures to go along with the successes you listed. Its notable, however, as All Aboard says, that more than a simple character swap was done in those successes.
There were more changes to Cinderella than making her a prostitute, more to West Side Story than changing the race, etc.
Your examples are the equivalent of revamping the ENTIRE Winnie the Pooh story to reflect that of a little girl's imagination. Yes, the possibilities are interesting. But leaving the other characters essentially intact and simple changing the gender of CR is nothing even remotely resembling the changes of which you are speaking.
They didn't make Mickey's Christmas Carol by only changing one character to a mouse. (btw, not that it matters in this discussion, but Scrooge was a duck. Cratchit was a mouse.)