Backup: Colt McCoy

Best-case scenario: The second-year starter builds on his 2012 success and gets the 49ers over the hump to bring San Francisco its first title in 19 years. Smart play on the field = fans getting stupid and going dumb in the stands!
Worst-case scenario: Defenses around the league adjust to Kaepernick and bring down stats like his 98.3 QBR and 31.9 rushing yards per game average. That or a serious injury to the young QB could put an end to the 49ers being Super Bowl favorites. Kaep then demands a trade to Miami in the offseason because he loves their snapbacks.