The reason they've given for dropping it is that ME pupils were upset by the racism. I'm white, so I'm not qualified to give an opinion on that.
I remember studying this book (same cover too!) for my GCSEs in 2004. We had some good discussions about misogyny, WRT to "Curly's wife" remaining nameless throughout, only a person in conjunction with her husband, not someone in her own right.
I think the GCSE texts need shaking up anyway. Some of them are as dull as ditchwater. The English syllabus should be about getting DC excited about reading and understanding the texts, not putting them off. Imagine studying The Hobbit, or Harry Potter!