My next-door neighbors installed such a system (but at more like $4/Watt) on their roof. It powers everything in their house, including their pool pump and HVAC. Excess power goes into the grid and runs their electric meter backwards. Their total electric bill last year was for less than $20.

So yes, I know that people will install such systems for their own households because many thousands of households have already been doing just that for several years now. The main roadblock at this point is the cost. At $4/Watt the payback period is in the 5-10 year range, depending on your local electric rates. At $2/Watt the choice becomes a no-brainer! Several states and the federal government offer rebates and tax deductions to offset the initial cost. There are even companies that will finance the installation so the consumer pays little more than they would have paid in electric bills over the term of the loan. Once the payback point is reached, the homeowner gets essentially free power for the 25+ year lifetime of the PV panels.

If they can really get it down to $2/Watt, they will capture 100% of the market and they will be able to put a PV system on every roof in America, as well as exporting billions of dollars worth of them to the rest of the world.