Not a majority, to be sure, but still a sizeable number. Yet if philosophers do genuinely accept the conclusions of utilitarianism, why are they so reluctant to join the utilitarian "movement" -- actively try to translate utilitarianism into practical ethics and political policy, through popular books, articles, public speaking, etc. Compare the vigorous way that scientists have engaged in the climate change debate. Why are so few philosophers doing the same?
I also note that utilitarianism seems to be relatively unpopular among college students open to new ideas. I had multiple friends at college who took up orthodox trotskyism and Leninism, radical environmentalism, radical gender politics, anarchism, animal rights -- and the grand sum of zero friends who were passionate about utilitarianism.
What is it about utilitarianism that is failing to inspire those most amenable to radical ideas?