It's a Democrat state and Democrats aren't going to do anything that gives them less power.
They aren't going to create some rural state that might vote Republican.
The point of the change won't be to separate Republicans from Democrats or conservatives from liberals, it will be to give San Francisco and Los Angeles more clout in state and federal government.
There would have to be a 1:1 package deal to win GOP support.
Without it, its going to be DOA. Only the seriously deluded would think the GOP would give the Democrats more Senate seats without getting something in return.
Right now there’s nothing in it that makes Republicans want to support it.