A couple of things.
1) If you are getting PV you will have to keep your old electric meter or turn in the new one for the old one, the new ones don’t run backwards.
2) If you are net metering and SDG&E goes down you will be without electricity just like your neighbor that doesn’t have PV.
3)The rebates keep getting cut in half roughly every year to 18 months(depending on market penetration).