And it's dying because the scripts & characters are unrealistic,
Wrong.
The scripts have always been unrealistic; people don't care. What's killing soaps in America is a combination of changing demographics and economics.
Not in England, or South America, I'd wager.
unlike British soaps (Coronation Street, Emmerdale & East Enders),
How many times a week do those air new episodes?
Same amount of time their American counterparts do. And they're all successful because they're not unrealistic bullshit with plastic people (last time I checked.)
Elizabeth Taylor did "General Hospital" back in the "Luke and Laura" days, BTW. She was a huge star, of course - she just liked the show.
More power to her.
So did Sir Ian McKellen on
Coronation Street, as a fraudulent so-called writer. But I don't think that it was stunt casting, though.