The same system today would not offer a decent return because the rate PG&E pays now is wholesale, approx 4 cents per kWh. I get like 36 cents. Today you need a battery to make it worthwhile, and that basically doubles the cost of the project. Now with current electricity rates continuing to rise, some of my neighbors are doing just that.
I'm not sure I follow your "cost X ..." point. The solar project continues to realize a nice cost saving and will do so for many years going forward. People can pay $200 and more per month for electricity; my bill is next to nothing.
Sure not everyone has the same opportunity. Solar makes sense here, with our many days of sunshine. And I purchased under NEM 2, which offered the better payback for generation. But I researched solar for 5 years and pulled the trigger when it was a huge no-brainer. Solar may not make sense for other geographies, but there are other opportunities if you seek them out. Heck I can be pretty darn envious of the prices many areas pay for energy.
Ya win some and ya lose some, I guess. All good.