I am URJ (Reform Judaism), and as such I am one of those Jews who don't formally subscribe to the concept of a personal Messiah. We hold that prophecies of the Messiah in Tanakh are personifications describing the promised Messianic Age. In line with this it is the Messianic Age that we are still waiting to come, but I have no arguments with Jews who believe otherwise.
As to the comments you posted regarding the JW view of the Witnesses regarding the Jews, I was not arguing with the talented Rabbi was wrong (who I happen to admire very much as a matter of fact). I was instead offering a counter argument that could validate why some individuals might not agree with Rabbi Berenbaum. It is Jewish custom to open every view to critical analysis, and that is what I was doing.
However, it has been the Roman Catholic Church and not Jehovah's Witnesses who have radically changed their views on the Jews. With Vatican II the Catholic Church denounced proselytizing of Jews, Replacement Theology (Supersessionism), and teaches that the covenant relationship of the Jews with G-d are not only still valid but irrevocable. The Pontifical Biblical Commission in a recent study on the Jewish people in the Christian Bible has stated that the current division of Church and synogogue is not only unscriptural in the eyes of the Holy See but should have never happened in the first place. Recent comments from Pope Francis have reiterated that proselytism of the Jews and any type of anti-Semitism is forbidden among Catholics. And Hebrew Catholics are allowed to retain Jewish customs, including the wearing of kippah and observance of Jewish holidays.
While as a Jew I am not endorsing Catholicism, it must be admitted that these changes are a far cry from the current views of the JW and foreign to the direction the Governing Body seems to be currently taking.
Not that I think the JWs are incapable of such change. In fact it is because I know that they are that I do not share as positive a view of the Watchtower as some might.