The real issue with Bishop is way more fundamental. She is a...

The real issue with Bishop is way more fundamental. She is a lightweight in every sense of the word. She will never be leader. I agree with your observation about ScoMo.

So it just leaves Turnbull....?

And that is why he has survived to this point. No realistic alternative.

Trump and right wing populism have totally changed the game. If the Libs saw Turnbull leading them to an inevitable defeat, the right wing crazies might even gather enough support to run Abbott again - Abbott would be prepared to form an alliance with One Nation to form government. Anything is possible now.