Mac users have been pleased with the GUI for over twenty years. I don't think they're wrong. It won't work. There is simply too much history. Sort of like the New Coke fiasco.
People expect certain things.
Deny them that at your own peril, profits and humiliation. Using America's Favorite TV dad, Bill Cosby, couldn't save New Coke. If the classic interface remains an afterthought, Apple is in trouble. When I was in school, the government wanted to convert the country to the Metric System. They were probably right.