I'm on board with Von's comments, because of the context and the timing. He's setting a tone for the mentality and approach that the team should take this off-season imo. And stating it this early really isn't going to have the same impact, as far as pressure goes, as it would if he made it in the summer right before the season starts.
Normally, I don't like these kinds of gaurantees, because they seem to blow up in teams' faces more often than not, but in this case I think it's a great way to set the tone for the off-season. They need to look at this season as though it's unfinished business, because by the time the playoffs started, the Broncos had as good of a shot at winning it all as anyone, and they let the opportunity get away. They need to get back to work and plan to win the Super Bowl as if it's the only course there is.