California is being meaningfully DE-gerrymandered by a non-partisan commission. It will remove some safe Republican seats which did little more than allow incumbents in the California GOP to be lazy, and create a bunch of districts that good Republicans can win with a solid message and effort.
As long as the districts are compact and logical we will have to let the chips fall where they may. I for one am going to loose George Miller as my congressman, so that is good from my perspective!