This is all indirectly a good thing. Maybe the die-hard Democrat Jews will finally get the message how Leftists and Democrats really feel about Jews.
Some will justify this by saying that they are against Israel as well, so what? But I suspect a larger percentage of Jews are going to catch on that the Left isn't just anti-Israel, they are in fact anti-Jew. All though history, they always have been. And for some reason I will never understand, while being anti-Jew, they seem to be pro-Muslim.
The more Democrats that boycott Netanyahu the better it will be next election. While the really 'maniac Leftist' Jews will never vote for a Republican under any circumstances, (their head would literally explode if they did that) they will be more likely to stay home and not vote. It is hard to believe that even die-hard Leftist Jews would vote for people who have demonstrated that they don't really care much for Jews. But you never know. Jews are a notably strange people, and Leftist Jews are mostly downright crazy. So, anything goes.
Right now the Left is focused on stamping out Christianity in America. Only because, they are the easiest and less 'politically correct' group in America. Once they finish with the Christians, they will immediately turn to doing away with any form of Judaism or Jewishness in America. It is hard to believe the American Jews cannot see this coming. It is amazing really.