> Filling the gaps left by intermittent production with storage

That will work for shifting day & night, but I don't see any feasible energy solutions for summer-winter shifting, or even to bridge weeks with limited sunshine (and/or wind).

There are large populations living relatively far from the equator, which see huge differences in daylight during summer & winter.

We should try to get as much energy from renewables like sun & wind, but I think we'll still need another form of energy generation. Energy storage can help us increase the upper limit of renewables in the total yearly mix though.