Some studies beg to differ. Also improvements in batteries will make this problem much less important. And even then, they don't have to cover 100% of the energy generation, if they cover a significant % with the rest provided by more traditional sources, it might be enough.
Good luck with storing GWh of electricity in batteries for more than 15 minutes. They have terrible energy density even before mentioning costs. In fact they're not even cost efficient for home scale battery backed solar/wind projects. You need to replace the batteries every 8 years. How do I know that? We've been installing PV for 10 years. The only uses for battery backed PV/wind were remote areas with no grid access.
The only commercially viable electricity storage available today is pumped hydro. Flywheels and molten salts are also working technical solutions and could be used for wind and solar thermal.
The articles mention many options and reasons why the base load problem is vastly overblown. Batteries will probably help in households. The combination of all these methods is what you have to look at. And these technologies are still rapidly improving, they should start being a significant % of energy generation and start taking on the base load issue slowly of course.
The only commercially viable electricity storage available today is pumped hydro. Flywheels and molten salts are also working technical solutions and could be used for wind and solar thermal.