I suppose the ultimate arbiter in language is usage, and usage is dynamic and evolving and it is subject to fashion. An essential element of the debate on language use, grammar, punctuation and the rest, is the desire of some people that English, retains the capacity for precision in standard day to day conversation and other forms of communication. It helps if we can use language precisely, as it aids the expression of ideas, thoughts and opinions. One of the best qualities of English, however, is its flexibility, which will surely mean that new usages, neologisms, backward constructions and the rest will keep happening.
A bit of dialectic concerning usage may help retain precision. Many of us get a bit irritated with how some words are used, with punctuation being wrong and with wonky syntax etc, but there is little point in getting worked up about our particular obsessions.
It looks like Mr Gove wants the use of grammar, punctuation and syntax to be given more weight in the marking of exams in the future. Time will tell whether this has any impact.
"I was like...... and he was like........." Aaaaaaarghhhhhhhhhhhhhhhh.
"I'm loving this band." Eh?
"Sort of like, you know." Yeeuurrgghh.
" Ve free frushes went to Frum Hall." Do you have a problem with your teeth?
("The three thrushes went to Thrum Hall?")