Sorry, I think you missed the point.
People who want to defend the honor of Newton against Smith have no leg to stand on. Smith has been winning and playing quite efficiently. You just can't argue against his record and rating when you team is underperforming like ours is. SF has a QB controversy not because Smith played badly, but because the ceiling of Kaepernick is so high after he looked so good in the time he was given. He was the guy who was bigger, faster, and had a better arm than Cam in that draft class, that is saying a lot.
Smith certainley has been efficient. But there is a reason he possess one of the lowest attempts in the league. If he was a truly talented Qb wouldn't the 49ners want to take advantage of that? Smith's ceiling had been met. His presence limits what this team can do potentially own offence.
Colin certainley deserves credit, but Smith low ceiling and limitations are big contributing reasons why this switch is being made.