That's a pretty big leap. I'll concede that it helped, but your statement implies that it was the main reason. Specifically looking at the O-line, it was the emergence of Josh Sitton that really helped. Wells was playing the center all the way and finally put together a good season. Clifton was never juggled around but took until mid-season to finally "warm up" and play like a pro bowler. As for Rodger's sack count, that also had a lot to do with him learning how to run an offense.
It's also worth recognizing that the lack of a running game has been very good for the Packers in recent years. In 2007, we had nothing and Favre torched the league until Ryan Grant came to town. In 2010 we lost Grant and Rodgers then came alive. Again in 2011 with not much of a running game or commitment to it, the Packers thrived on offense.
There are surely 20 other factors that could be listed. Although back to the question at hand, Bulaga has found his spot. I'm a huge fan of at least having a solid right side instead of moving our RT to LT and bringing in a new RT....then you've got two weak positions. I also think that Newhouse will come into his own this season and Sherrod will develop in Newhouse's shadow. I've said it before, but Newhouse reminds me of how Earl Dotson used to play.