Meh, fairly uninteresting. Although, i doubt many people care about the 'gendering' of the words given it seems to be solely an issue for strange activist sorts with little better to do than complain about their being sexes.
On the flip side, i never really liked calling teachers 'sir', it giving the distinct impression of a master//servant relationship.
Calling someone, as they say in the article, 'teacher smith', as a form of address, seems rather clunky and odd though.