It's unlikely to occur so quickly, and perhaps it's for the best that it doesn't.
However, it's approaching. McCarthy has not demonstrated the capacity to manage adversity throughout his time in Dallas.
One thing I hadn't anticipated was Zimmer's horrible showing today. He seemed like the obvious choice for Interim Coach, but with repeated performances like today's, it's questionable to put him in that role.
I believe they will go with Al Harris if (when?) they make the decision, with Zimmer staying on as Defensive Coordinator.