I absolutely think it's a problem that the vast majority of elementary school teachers are women.
I don't think it's inherently terrible to have fields that are dominated by one gender or another but I do think that in the case of school teachers men are being pushed away by social forces and it's detrimental to all children to be taught only by women.
I'm interested to know why you think this is a problem?
I, for one, didn't become a teacher because the pay is terrible, I make more annually my first year out of school (programmer) than most highschool teachers make anually.
It had nothing to do with gender, more to do with money.
Also, my mom is a highly advanced math teacher (teaches AP courses, grades AP tests etc), so I think she provides a good rolemodel for women and men who want to be good at math.
I don't think it's inherently terrible to have fields that are dominated by one gender or another but I do think that in the case of school teachers men are being pushed away by social forces and it's detrimental to all children to be taught only by women.