It will evolve. There are storage options. Use electricity (or sunlight) to generate Hydrogen and then turn Hydrogen to electricity with fuel cells. Use electricity or other processes to generate ammonia which then can be used to generate electricity as needed. Flywheels. Batteries. Of course, we need improvements in these to make them feasible.
I don't know that people are putting the cart before the horse. Things will need to be dealt with by you can't just say, "Let's wait until we have all the problems solved and then start thinking about it." The government creates incentives which gradually ease us into transformation making it feasible and profitable. Gotta start now if we are to be ready in 30 years when oil dependency for energy will cripple us in many ways.