Yes I imagine most people in the future will need a significant amount of batteries. For the home to store energy when the solar panels are not receiving sunlight e.g. Powerwall. And also for the car, phone, tablet, laptop etc. Batteries are going to be an increasingly critical part of the power lifecycle.

And solar roadways do work. But at least in current incarnations are better suited for pavements, open areas. And it may be expensive but that's only because we don't ascribe costs properly to fossil fuels e.g. carbon tax, health tax etc.