I never thought I'd say this, but signing Kapernick make a ton of sense right now.  

With the struggles of the O-Line, the best chance for this team to win is with a QB who can scramble.  Brock can't do that.  Lynch can run, but his inexperience in decision making at the NFL level has plagued him, (maybe someday he'll be ready, but not yet).

Kapernick has the arm and accuracy to get it in the vicinity of DT and Sanders, know's when it's time to throw it away, and his speed would put other defenses on notice.  

With the trade deadline all-but passed, it's the only option to get this team into the playoffs...