You do realise the setup and cost model the solar companies are going with?
How Much Do Solar Panels Cost? - Solar Energy Cost | SolarCity
And you do understand that burning gas today is basically the same technology of 50 years ago, and there's not really more to add to it to make it more efficient.
Where's with solar say there's been a 70% increase in efficacy just in the past 12 months so if you even try and predict 10 years out its scifi.
But I will do it anyways :P within 10 years solar setup to power a house will be under $1500 dollars. For no other reason than that's what China needs.
who needs to buy gas when you can just make it? or paint it
New Inventors: Solar Paint
https://www.youtube.com/watch?v=Ci6LKz0ajfI
And they are already working towards commercializing it, tis not a prediction its in motion.