Metronet to become next Network Rail?

I read the headline "London mayor's transport team in talks to take charge of failed tube contractor" and so into the article where it was mooted that Metronet's contract will be taken over by TfL. However, half way through one notes that this story was driven by (my own) trade union Unite's statement that the Mayor had proposed to "limit the period that Metronet remains in administration and instead bring the operation under the control of TfL." This was withdrawn after Livingstone said it didn't reflect reality. I can't see Prime Minister Brown yielding to this either after the PPP was pushed through at his behest.