Would it? How do you know?
It's not that nothing has gotten better, but it's obviously relative. Everything has two sides.
- Marijuana was legalized and the convictions of thousands of inmates and priors adjusted accordingly, bettering the lives of thousands.
- Better protections and benefits for those here illegally.
- LGBT protections and rights under the law have greatly expanded.
- Worker protections from discrimination and predatory employers has expanded.
- Most types of crimes have decreased (and if you think things have been wrongly decriminalized, I'd be interested to hear what they are).
- Home values have probably doubled in that time without property tax increase.
- The tech industry continued to grow and employ more workers.
One could go on.
Instead of costing citizens, working with federal agencies to remove illegal immigrants would be the better outcome. That would do a much better job of actually eliminating crime instead of enabling it with driving privileges.
But... you still haven't answered what has gotten better in CA over the last 10 years. So let's call it done now.