You point out that Elon has identified three key components necessary to accelerate the adoption of sustainable energy, but I think he has actually identified 4. The 4th being finance. And the Solar City alignment really reinforces this. SolarCity is above all a finance business. And if you want to convince a household to spend $50K electric car, 10K battery and another 10K on roof top solar, then you really need to package it up in one easy monthly payment. And that is obviously his master plan.