I don't think a petition would help - who to and what about?; I heard about this last week, but am not sure about the background.
Not sure what I think about Platts's argument, I have to say. I'd be very surprised if the MA were completely government-dependent. Don't know how much it generated itself, who else it got funding from, etc...
NSPCC has swallowed up ChildLine as well, btw.
(Sorry, I write about this sort of stuff from time to time!)