No. This basically is another one of those sophomore-slump questions. It assumes that a quarterback temporarily stops growing after his rookie year. That's an erroneous assumption.
What's more, Kaepernick hasn't even had a full freshman year. The kid's had all of 11 starts.
This technically will be Kaep's junior year, but he didn't start until last season so, all good. Teams have film on him and the team's tendencies. Smart coaches will have counter moves.
How do teams know what he's going to do and who he's going to be, if Kaepernick himself doesn't know what he's going to do and what kind of QB he's going to be?
There are scouting reports now. I love Kaep and I think he'll be great, but like how he was a surprise last season, teams will have some stuff for him. He'll be helped by a nice power run game.
Don't forget the best offensive line in football. Kid also has an incredible work ethic. Even so, like so many before him, defenses won't just lay idle to get whipped.