We just had a 14 Kw system installed on the roof of our house (40, 350 watt panels.) In fact, it hasn't even been turned on yet, because we're awaiting final inspection. I think solar makes a lot of sense in this part of the country, but it ain't cheap.
My biggest problem with this new law is that it's just another example of big government thinking they always know what's best for me, and it always ends up costing me money. Pay attention over the next few years and you'll start seeing new laws that will dictate what kind of trees and plants you can have, and where you can plant them to ensure that they don't shade solar panels. They'll pass laws mandating that you keep them clean, and that they generate a minimum amount of power. I know how the people who run this state think.
I guarantee you that this new law will increase the cost of solar, and of buying and owning a home, in California.
Kev