If Gazidis leaves, there is no way they hire someone that can potentially shake the boat and ruffle the feathers of our golden goose Wenger. Stan would hire another puppet and make sure that they love Wenger as much as he does. In that sort of situation you can only hope the new appointment is a devious, manipulative bastard that's playing the long con and trying oust Wenger but in a sneaky way. Much like what we may be seeing from Ivan. How many years would it take for us to see any real change in that situation?
I really can't see Stan hiring a new CEO that isn't tame and feeble. If he were to, I'd imagine he'd hire someone that would want Wenger fired for the amount of money we waste. A real extremist that will aim to trim as much excessive fat as possible and go for a low investment, low expenditure policy. We'd really be fucked.