[ryankupyn]

I'm really interested in seeing how this will play out if solar continues to get cheaper.

I'd imagine that at a certain point, the panels themselves will be cheap(er) compared to the installation cost (so that the cost structure changes to favor the most efficient installation/maintenance regime), and that residential-scale solar will be uneconomical compared to large-scale installations in the desert, where you can get a couple of hundred megawatts all in one place getting the advantages of optimal weather, easily-installable sun-tracking, and more regular maintenance than what you'd get on a 1,500 sqf roof in SF.

It's entirely possible that, 10-15 years from now, this ends up being a "tax" paid by all homeowners to the residential-solar-installation industry so that they can put solar panels on roofs that will never earn their money back, just so that the homeowner can displace what might be equally clean energy generated elsewhere.