An ending of some kind is building, because the Nephites are again apostatizing. To make matters worse, they are becoming Gadiantons. Even among the righteous Lamanites, there was an apostasy from the true religion, and an increase in the influence of the Gadiantons. The destruction of the Nephites at the hands of the Gadiantons is coming. Mormon will see that scene repeat itself four hundred years later.
This is not the end of a chapter in the 1830 Book of Mormon.