I think you can learn more from a loss sometimes than a win. While the talent level between Minn and Dallas is about even (in spite of the score) the one HUGE advantage the Vikings had on us was on the lines. The Vikings got great pressure on us with their front four and killed every slow developing running play.
I have been saying this for some time, but I really think for this defense to reach its potential that at some point, we need to get a mammoth NT to collapse the pocket. Ratliff is great at rushing the passer and shooting the gap, but he's not going to collapse the pocket like a huge NT would. We are already moving Ratliff around, so I don't see it as a negative moving him over to DE.
If you add that element to our defense, then we become as dominant on the defensive line as the Vikings were ....... that doesn't mean we can't win a Super Bowl without one, but I really think it improves our chances.