I think Hillary will at least maintain the Obama coalition in California, which means something in the area of 60-62% statewide. I don't think any Republican candidate can even break 40% in California in 2016.
I'd tend to agree with you.
All Democrats running statewide (Brown the most noteworthy) basically didn't run general election campaigns in 2014. I think I saw one Kamels Harris ad the entire cycle. If California 2014 happened the way it did, when turnout ticks up Hillary shouldn't have a problem getting to 60%.