Game, set, match, BFF.
No one will be calling for Harbaugh's hide. He's a deity already.
Except that CK was someone the Niners and their quarterback guru loved and traded up to draft.
It's a bit too early to say that it was definitely the right move but lots of people would have been happy with Russell Wilson, Nick Foles, or Kirk Cousins instead of TJ Graham.
Anyways regarding the Niners QB situation, yes CK has an extremely high ceiling but as a very inexperienced QB, he has a lower floor than Alex Smith.
At least with Smith you have a known quantity (quality NFL starter).
Undoubtedly the opposing DC are gonna cook up some things that CK hasn't seen yet and there'll be some rough spots as there always is for young QBs.
The Niners hope is that his growing pains don't result in a loss that hurts their playoff seeding or knocks them out of the playoffs.
CK is auditioning now and the Niners can evaluate on a continuing basis. If CK does anything to create too much doubt, they'll go back to Smith.
I think the risk is minimal.