What if Everyone had Rooftop Solar?

   What if everyone had rooftop solar? What if prices dropped enough that most people placed solar panels on their roofs?
   There would still be those times when the sun's rays weren't there, thus requiring the power companies. But, to some extent, the dominance of solar power would bring the power companies to their knees.
   And, one has to wonder if they don't recognize and fear such a day could come.
   And, if the day comes that good batteries are mastered, then homes will become self-sufficient, not needing to rely on the power company for energy when the sun dips behind the clouds. Then, will we need power companies any at all?