Should schools be banning slang?

In ‘The Guardian’ newspaper on Wednesday 16th October, there was an article about banning slang in schools. Harris Academy in Upper Norwood placed posters around their school stating that specific slang words and phrases such as ‘innit’, ‘bare’, ‘like’ and ‘we woz’ are banned within the school. The school took this action in order to help their students to "develop the soft skills they will need to compete for jobs and university places."

But is this the right decision and will it have a positive or negative effect on the children’s attitudes to learning?

Some students may feel that the school is changing how they talk normally or that they are not being accepted by society due to the way they talk. With the media and surrounding entities playing such a big part in teenager’s lives, can as adults just change their vocabulary overnight? They may need to come to understand that their language may need to be adjusted according to the situation.

Is slang THAT important and will it last?

What do you think?

(a link to the full article:
http://www.theguardian.com/commentisfree/2013/oct/16/banning-slang-harris-academy-alienate-young-people)