There are still areas of the country where you need incentives if you want to continue adoption of solar. At 5-7 cents per kWh for nuclear+coal here, creating a payback period - even if you use annuity models on growth of electric prices - can be difficult. As a result, we're very much where California was a decade ago -- very few installers, ones that are pricing primarily based upon the incentives ($4/W is the best price you can find).
I think a good chunk of the edges of the country (CA, AZ, FL, etc.) have done their jobs, but there's a good chunk of the country that still needs the incentives, IMO.