Answer:
When Rodgriguez says that Americans might become a mestizaje society he meant that Americans may become a mixed culture.
Step-by-step explanation:
By Mixed culture, he means that mixing of various ethnicity with that of Americans so that Americans may lose their own identity. In his own book, he himself said that he had become a Chinese not by birth but by looking and growing up with the Chinese ethnicity in his neighbourhood. Mixing of ethnicity or Mestizaje does not necessarily mean that converting into some other thing but ideally accepting their culture is itself a mestizaje process.