[Question] Why Talmud got completed by 600 CE if it was Rabbis discussing the Torah and law?

I am not a Jew, but a Hindu but has some interest in Judaism. As I read about Talmud, it was just Rabbis discussing verses on Torah which spanned centuries so why it suddenly (mostly) stopped in 7th century? Also, if time demands in future, would new pages be added to it or some new book be created to talk about interpretation of law in present era.