At what point would a skins fan be justified in calling for Gibbs' resignation?

[Southpaw]

I've been critical of some of Gibbs' calls as head coach, but I think it's far too soon to be calling for his resignation. He adopted a franchise that has been handled poorly, from the top down, for the previous decade. He should be given at least the length of his contract to try and right the ship.

But I also think there's only a 50/50 shot of him still being the head coach next season, and Campbell could be the determining factor. If Campbell shows potential, I could see Gibbs coming back and trying to build from the positives. If Campbell completely flops, Gibbs might just decide he's had enough, and hang it up.