There is nothing to "fix" in CAROUSEL. First, the very notion of translating the source material from Hungary to Maine was an inspired choice--audiences can identify with the American milieu and the types that inhabit it. And, yes, that's how New Englanders speak (even today), especially 19th century rural New Englanders.
Nothing demonstrates the abysmal state of education today than the inability to understand metaphor and its resonances. Everything is taken literally and at face value--no thought, abstraction or nuance possible (which of course is the fundamental principle of cancel culture). Can ANYONE seriously think that R&H--of all people--were advocating patriarchy or domestic abuse in the show? Or that the values of the characters always represent the values of the writers? Characters without flaws or flawed objectives would leech the story of conflict, the very heart of drama.
It is absurd to argue that the very innovations and adult subject matter for which R&H were famous also undermined the shows. They knew their audience. They knew how to interpolate their innovations within the conventional/commercial demands of the musical theater. Most important, they were pioneers at establishing a balance between "realism" (psychological or otherwise) and a romantic sensibility that allowed the story to soar on wings of gorgeously crafted song (something missing on Broadway today). Without these smart, intuitive approaches, the shows may not have been successful and we wouldn't be talking about them today (will anyone be talking about THIS IS US 75 years hence?)
Of course the R&H shows are idealized--they're essentially operettas. A certain lyricism has to permeate the entire production so the transition from speech to song can be achieved seamlessly and romance can bloom (unlike the recent Oklahoma revival, about which the less said, the better).
Let's also remember that R&H wrote South Pacific in the shadow of the Holocaust and a world conflagration. Their theme of racism was a global one.
"The only problem is today's Gen Z (and some Millennials) audience demands that they ONLY be exposed to characters they approve of!" Which speaks volumes about the popularity of the narcissistic, morally relativistic characters in DEH.
As far as changing the story to suit present-day mores, there's a little thing called copyright that would prevent that. It would also be an insult to the men who, in fashioning a drama representing THEIR concerns and THEIR point of view, went through the agony of getting it on the page. You have something you want to hear said? Write it yourself.
Very astute observation about the final speech in CAROUSEL, r18. Which is why the show is called CAROUSEL, a circular metaphor, one that can apply to the spiritual "reincarnation" of Billy and also suggest the breaking of a cycle of behavior.