Why should this novel be included in the school curriculum?

This all depends on what age group you are considering. This book is deep and textured. I might consider an older class in high school or perhaps a class studying early New Mexican culture. Check out this review. It summarizes the reasons why I like this book,

http://articles.latimes.com/2013/feb/21/local/la-et-mn-bless-me-ultima-review-20130222