Kicker injuries can screw with their mechanics, and if that injury were bad enough to keep him out of a game entirely, then it's likely to cause him such problems for an extended period of time.
I agree, that Burnette has been a disappointment for us this year, but I understand why he may be having issues.
I also agree to give the younger players with the better talent a shot. I think that with more experience and fewer jitters, Schmidt may turn out to be just fine.