I think renewable energy is just a temporary solution to get rid of fossil energy and nuclear power. Humans will have to find a new form of energy to serve humanity to develop to a higher and more sustainable level. We are hoping for scientific and technical achievements.
What form of energy we are talking about, solar energy can be implementing in places where they get ample sunlight and it wont help in countries where there is freezing cold all round the year, but the major problem i see with the solar energy is that the battery technology has not undergone any major changes for decades and they have a life span of 5 to 8 years maximum and even if i want to move to solar energy the amount of money i need to shell out for maintenance and replace batteries every 5 to 8 years will be huge.