Not exactly dispositive with respect to nationwide interest, but here are interesting results of a review of Women's Studies at public universities in North Carolina:
In 2003, UNC-Chapel Hill had 15,089 undergraduates and only four graduated with a major in Women's Studies; meanwhile, UNC-Greensboro had 12 out of 10,751 undergraduates interested in the same major.
East Carolina had one graduate, while UNC-Charlotte, which only offers a minor in this area of study, showed an upswing in enrollment, with 17 undergrads.
N.C. State had only nine students enrolled in the Introduction to Women's Studies course out off 22,971 students.
Link.