One of the peculiarities of Jewish psycho racist extremist eliminationist supremacism is that World Jewry will not react rationally to boycotts or similar actions. Their mental illness renders them incapable of understanding the reactions of decent people to their violent craziness. Instead, they will label it as just another example of the ubiquitous 'anti-Semitism', i.e., an example of the moral failings of their accusers, and not of their own moral failings. The short-term effect of boycott-sanctions-divestment will be a paradoxical hardening of the positions of Israel and World Jewry, as they will see the increase in 'anti-Semitism' as an excuse to act even more insanely than before.
That is not to say that boycotts aren't morally necessary (the true status of Chomsky can be seen in his continued resistance to boycotts, as he prefers to wait for his socialist-anarchist paradise to save the world from the problems caused by . . . the Americans). They will have the effect of continuing the legitimacy crisis in Israel for those Jews who aren't insane, will increase the phenomenon of sane Jews leaving Israel, and deter sane Jews outside of Israel from moving there. They will also increase the expense to the Jew-controlled American government of paying for the continuing Jewish program of slaughtering. Most importantly, however, the whole boycott program will serve as the rallying point for world-wide resistance to the Jewish eliminationist program. One of the main problems decent people face is that the total Jew-control of politicians and the media - as definitively proven by the utterly shameful reaction of all Western politicians and media to the Gaza slaughter - seems to make it impossible for decent human beings to do anything in the face of such powerful and overwhelming blood-dripping-from-the-fangs Evil. Boycotts can start us on our way.
More important than boycotting Israel, however, will be our efforts to punish those who are under Jew-control, to make it clear to the sycophants and power-followers that there are powers greater than those of World Jewry. For example, punishing the shameful BBC executives who censored a charity appeal for Gaza - just how fucking evil can you be! - by firing them and making sure no one else will hire them - except, of course, the Jewish Billionaires! - will start to send the message that we the decent and sane will no longer put up with the evils of Jew-control. It is the boycott and punishment of the enablers of Jewish evil that will have the biggest long-term effect at stopping it and establishing one Palestinian state in the Middle East.