I think Parcells felt embarassed at home and in front of the national audience by the Bledsoe interception. He was absolutely fuming and Jerrah was angry (you saw it in the box). He acted quickly, decisively and IMHO, stupidly.
In the second half the game went from a 5 point very winnable game, to gameover in seconds.
Bledsoe deserved to be screamed at, ridiculed and horsewhipped at halftime and then alllowed to go out and win a football game.
I am still a big Bledsoe supporter, but this is his last year here, no doubt. Therefore I want Romo to start the next 2 games; if he wins them both, he stays in, if he loses them, he goes back to the sideline to take the experiences of this year and build on them as he watches the team the rest of the year.
Then, Parcells tells Bledsoe the team is yours for the rest of the season and I want you to continue (because he really has up until Sunday) to groom Romo as the starter next year.