I think the Romo injury demise might be getting a bit overblown. He's had some back trouble and it's concerning, but not a death sentence. Especially when the last one, as I believe LT pointed out, was removal of a cyst, not structural damage.
I think Romo can remain an effective QB in this league for a number of years to come. The bigger issue is that his cap hit is going to be $27 million next year. If Romo isn't a Cowboy in the next year or two, I think it will be for cap reasons, not because he's physically unable to perform at a competent level anymore.
In hindsight, if Romo wanted to remain a career Cowboy, I think signing that mega-extension was the worst thing he could have done.
Of course, if he just wanted to rake in a huge signing bonus, mission accomplished.
Personally, part of me hopes we cut him and he goes to some place like San Francisco and wins a ring to stick it to Jerry's incompetent team building.