This article in the NYT points out:
Unlike other states where teachers struck last year, California is firmly controlled by Democrats, for whom organized labor is a key ally. And the California teachers unions are among the most powerful lobbying force in Sacramento..... NYTYes, the Democrats are up against a wall.
The article also focuses on the charter issue - this is the NY Times after all --- who expected this?
NYT - Jan. 14, 2019