Why Did Radical Feminism Fail?

One of my recent projects is doing research on why radical feminism from 1967-1975 disintegrated. I know there are some who may disagree and argue that radical feminism held on and morphed into current feminism; however, I counter that around the early 1970’s, women became turned on to the issues radical feminists were addressing but didn’t want to give up their elevated status in society (or their husbands’). Unfortunately for those radical groups who altered the way we view revolutionary feminist practice and theory like Redstockings, WITCH, New York Radical Feminists, The Feminists, and Cell 16, focus shifted from radical politics and universal sisterhood to a split between ‘male’ new left groups and cultural (reformist) feminist groups like NOW.
I would like to know from anyone who may know more about this era of feminism what they consider aided in the downfall of radical feminist movement. Or, one could argue that there was no downfall. What are your thoughts?