No, although in all honesty a non-Trumpy, normal right-wing party would be able to keep California competitive, imo. Bush came within single-digits there in 2004, for instance, and even Carly Fiorina stayed basically competitive in the 2010 Senate race there.
The Republican Party of 2004 is very different from the Republican Party of 2016.
That is the point I am trying to make. The 2004 Republican Party could've competed there in a landslide victory, though in a 50/50 race (or even a normal victory) they would've still been disfavored. The 2016 Republican Party has no shot there at all, and indeed would struggle to eclipse 1/3 of the vote.