It's funny how many are overreacting to any developments good or bad.
Romo played against a depleted Seattle defense that kept its first team on for less than a quarter and played vanila defense- nor disguised coverages, minimal blitzing, etc. And that means he's ready to be the starter? Turn down a contract extension? People, chill! He's an undrafted free agent from a small school who has not done anything in a real game. How many QB flamed out after a solid REAl NFL game, not preseason? Do you want a list?
Be happy that Romo looks like he might be a good back up if anything happens to Bledsoe.