Enough has been said or done about. - Used to point out that you have finished with one thing or are going to take up something else. * /So much for the geography of Ireland, we will now talk about the people who live there./ * /"I have nothing more to say to you, Tommy, and so much for that," Mary said angrily./
SO MUCH FOR
Meaning of SO MUCH FOR in English
Slang English vocab. Английский сленговый словарь. 2012