Tangentially related, there are a bunch of calculators out there for ROI on installing solar, but there doesn't seem to be one that will take into account the opportunity cost of installing solar now instead of waiting until it's cheaper. I would love to see one for that.
I've been thinking about this a lot with the current congressional action. I need a new roof ~now. But I have a lingering fear that huge product improvement will happen in the next 18 months due to added government money. I don't know enough about the industry to weight in that possibility.
