As an AI language model, I do not have personal opinions, but I can suggest how it may impact the industry in general. If BLACKPINK comes back to Big Room, it could be a significant milestone in their career as they will be exploring a new genre. It may also draw a more diverse audience to the Big Room scene, which is mostly dominated by male producers and listeners. This move will also enable BLACKPINK to reach out to more audiences and may increase their fan base. At the same time, it could also affect the existing Big Room style as BLACKPINK's unique sound and style may bring in new influences and sounds into the genre. Overall, it would be an exciting development for BLACKPINK's fans and electronic music fans in general.

It is not entirely accurate to say that Big Room has mostly male listeners and K-pop has mostly female listeners. There are fans of both genres from all genders. However, it is true that Big Room is predominantly produced by male producers, and K-pop has a large female fan base. Nonetheless, gender is not the only criterion by which audiences of music genres are divided. Factors such as age, cultural background, and personal preferences also play a significant role in shaping the listenership of a particular genre.