I would not say it doesn't mean jack. It probably is not the most important factor, but it can matter. Going to a great college does not guarantee anything. I would not pretend that it does. Neither does playing in a major conference. I just think specifically between Romo and Rivers coming into the season, that Rivers had the advantage based on his big college background. That doesn't mean that Romo can't over take him. Just you have to start somewhere.
Romo is starting behind Bledsoe, who has the big college background, many starts in the NFL, big game expericence(even if it is all bad), obviously Parcells likes the way Drew responds to coaching and a big arm. Romo has very little to go on to get the nod.
If you are at a good college utlizing pro sytle systems, you can find out some of those answers about a player. That is why USC is producing some guys ready for the pros.