While I wouldn't defend Clausen and say that he is a good QB, I still would reserve judgement on his future based upon this years play.
No one on offense and 2/3rds of the D have looked nothing better than horrible all year long.
Kalil is not the future Pro-bowl C he looked like last year. Gross looks like he could be replaced with a half full sack of 'taters. Wharton was a terd when he was in the game. To be honest SS hasn't really looked like he was ever at any time the best WR in the game at one time. Williams was not inspiring and looked like a 3rd string RB, up until this game so did Stewart. King, who used to be reliable at least, is now one of the worst TE's in the league.
These are all guys that HAVE to perform at a higher level if a rookie QB is going to succeed.
I am as excited as anyone about the possibilities that Luck holds. However, if this TEAM doesn't start playing better then Luck will look just as bad or worse than Claussen does right now. You can bank on that.
last year Kalil didn't have revolving doors at both tackle positions. IMO, that is probably the biggest reason Kalil hasn't looked as good.