Split the Ninth
I have written about this issue in the past, looking at Judge Frank Easterbrook's views of the Ninth as well as Senator Murkowski's bill to split the circuit.
As you can see from the map, the Ninth Circuit is huge. Judge O'Scannlain points out that it covers nearly 40% of the land mass of the US. It also serves approximately 60 million Americans. It's staggeringly large. I think that it is just a matter of time before a split happens and a 12th Circuit is created. However, I don't think anything will happen until a majority of the judges on the appeals court join with Judge O'Scannlain's views.