I disagree. Romo is a big part of the franchise, but he's not THE franchise. There is no singular player on the team that IS the team. We won a ton of games with Kitna at QB. IF you have a realistic backup at QB, then we might not play AS well as we did, but we'll still be a decent team.
In my opinion, the reason why Jon Kitna performed better in the latter half of 2010 than Tony Romo did in the first six games can be attributed significantly to the change in head coaching. Certainly, Romo was pressing too much in the weeks leading up the Giants' game. His games against the Titans and Vikings in particular were typical of him trying to do too much to overcome the rest of the team's propensity of self-imploding.
However, Kitna took over for Romo full-time after the Giants game. The team performed laughably against the Jaguars in Kitna's first game. The team literally gave up against the Packers the next week in Kitna's second game. That game was extremely pathetic. Wade Phillips was finally put out of his misery and head coaching was handed over to Jason Garrett. Greater team focus and execution was clearly evident from Garrett's first game on.
I would hypothesize Romo would have been as successful under Garrett during the second half of 2010 as Kitna if he had not gotten hurt. The entire team looked almost like night and day from the time Phillips got canned to when Garrett ascended.