I think that an Academy for English wouldn't affect Britain's grammar, punctuation or spelling in any way. There will still be people out there who still use "txt spk" and poor grammar, regardless of having an Academy or not.
In my opinion it all depends on the situation of the person, whether they have had a good education or not, where the come from etc, when you regard the way that they use language.
To sum things up, I dont think it's right or even possible to monitor the way that English speakers use language, as it is forever changing and developing. An Academy simply couldnt keep up.
