The females using hijab as head covering, should have a clear understanding if they are doing it for fashion, society or if they really understand what it means in Islam. It's not easy to start wearing hijab as head covering, it isn't easy either to stop covering your head with hijab.
If it really is obligatory on your head or not, I think in the end it should be the choice of the females. Nobody should force them to use one or not to use one.