Well put, but I'm not sure why you assume all orthodox must be ethnocentric.

In fact, the orthodox have freedom to be universalistic because their religion is based on observance of Torah rather than ethnic identity. As long as you daven three time a day, observe kashrut and shabbos, etc., the orthodox don't care if your father was a rabbi or a Somali warlord--you're still Jewish. Of course, you'd have to convert, but that possibility is open to anyone willing to make the commitment.

I think the people really challenged by universalism are the conservative and reform branches, because few conservative/reform Jews really believe the Jewish vision of god and the cosmos.

Without an ethnic identity, the orthodox still have Torah, but the conservative and reform Jews have nothing.

None of this means that the Orthodox don't ACT ethnocentrically. Most of them do (just like most people in the world). But if we need to draw lines between the universalist and ethnocentric Jews, I see no need to put all the orthodox on the other side of the line.

(by the way--in case anyone is wondering, I am not orthodox and have absolutely no personal stake in defending them).