I see the ND D as a different animal this year. My thoughts aren't that the O will be overwhelming VT, I think it's the Defense. Their on a different plain than the O. The O with Book is just trying to catch up to that level of play.
I saw some of this last year with the LSU game (second half) where the D wanted it more than anything and finished the game that way. I believe I'm seeing that kind of play now and with the O backing up the D play by scoring has given them more confidence and more tenacity. I have not seen ND's D like this since the Holtz era the behavior on the field of "I want it".