You’ve got it mixed up. Wilson followed Deukmajian and killed CA for the GOP with the Prop 187 overreach and his “great” governing. He begat Grey Davis (Jerry Brown’s old chief of staff) who was recalled in his second term giving us Arnold followed by Jerry Brown Part II.
I despised Wilson, but never saw prop 187 as an “overreach”, it was a great victory which was sat on by a judge until it was squashed when a new (waited for) political leadership came into place.
What happened in California within the Republican party was that the moderates destroyed the party by joining with the left to defeat the conservative base, naturally the other party just steps in and takes over after that.