We have a course, Grammar for Teachers, required of almost all English
majors.  The argument we used was fairly simple: the English students who
graduated from our school--especially those who went on to teach English
K-12 (the vast majority of our majors)--said they needed it.  You might
conduct a poll and gather some data to see if you'd have similar results.
 
Larry Beason,Director
English Composition Program
Dept. of English
Eastern Washington University
Cheney WA 99004
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WAC Page: http://ewu66649.ewu.edu/WAC.html