In two seasons under head coach Jim Harbaugh, the 49ers have risen dramatically to become one of the NFL's best teams after a decade in the doldrums.In his first season, they reached the NFC Championship Game. In his second, they reached the Super Bowl. This year, some are predicting San Francisco to win it all.Las Vegas oddsmakers have picked the 49ers, and many NFL analysts have, too. And a computer program in Philadelphia called The Predictalator even simulated the NFL season 50,000 times, with the 49ers winning the Super Bowl 20.1 percent of the time, the best rate in the league.So, going into Game 1 of the 2013 season Sunday at Candlestick Park against the Green Bay Packers, the 49ers are well-positioned to make another run at an NFC title and the Super Bowl's Vince Lombardi Trophy. But not everything always goes according to plan. As good as the 49ers appear to be, bad things will occasionally happen to good teams.Here are five reasons the 49ers can win the Super Bowl, and five reasons they can't:WHY THEY'LL WIN IT ALL Colin Kaepernick. What everyone saw in 2012 was just the tip of the iceberg. The young quarterback will build on what he learned in his half season as a...