How safe are grammar schools?

Grammar Schools remain an embarrassment to all three political parties as they show up the utter inadequacy of too much of the rest of the state education system. Clearly, they shouldn't be allowed to survive, and it looks as if Labour are once again looking for ways to destabilise them, or even see them gone altogether, by easing the regulations on getting a public ballot in grammar school regions. Now let's see how Team Cameron reacts to that? I hear the sound of silence.