There's a lot of talk of bringing down Acacia, but uh... why exactly does she need to be brought down? :P 
Yeah she holds influence, but does anyone (even those who see through here charade) have any reason to believe she's got evil intentions. I mean as far as anyone can tell she's just another pureblood Slytherin snake sucking up and manipulating people so she can get what she wants. Nothing out of the ordinary.