49ers coaching changes

Something weird is happening. as a radio host said, Who would have thought that the 49ers, the worst team in the league could possibly lose it's offensive and defensive coordinators to head coaching assignments? More specifically, how can an offensive coordinator who's offences set records in futality, be hired as a head coach?
Well it has happened. Mike Mcarthy, 49ers Offensive Coordinator was hired on to be Green Bay's head coach.
So who replaces him? the Recently FIRED head coach of the Raiders, Norv Turner. Here's the thing on Turner, he's a good coordinator, but a lousy head coach. so maybe this might work out. Turner had Mike Nolan as his def coordinator in Washington. Also Turner was the Off Coordinator during Dallas's superbowl runs. So maybe it will work out. Hope so. but for the offense, there is no where to go but up. Bad doesn't define what they were last year. Horrible may not be able to describe it either. It can't get much worse. I can still get worse, but it can't get much worse...