It was the wrong decision. I state that emphatically.
Romo is one of the toughest, if not THE toughest players in the league. There was no question that he was going to try to return and play. Hell, when he broke his collarbone against the Giants, he tried to sneak back in, and was pulled back to the sideline.
That being said, football players are like boxers in that they ALWAYS believe that they can overcome an ailment and continue to perform. Similar to a cornerman in boxing, a coach has to look out for his players, and ensure that he is not putting that player/team in a position to fail, and or expose the player to further injury due to a lack of being able to protect themselves. The Cowboy coaching staff failed in this big time on Monday.
Romo could not throw with any velocity, and was incapable of protecting himself when it was on him to account for extra rushers in blitz situations. He was literally a sitting duck out there incapable of performing at his normal level due to injury. It's not a knock on Romo, just my thoughts on the situation.
There's a difference between playing hurt and playing injured.