Batteries can save the grid in the short term (all those unused EVs standing around) and more and more loads are designed to be controllable by power grid opera

Batteries can save the grid in the short term (all those unused EVs standing around) and more and more loads are designed to be controllable by power grid operators. You're making this a bigger problem than it is. In Germany, many households are currently replacing their old fossil heating with heatpumps, and many of the heatpumps are equipped with technology that allows the grid operators to switch them off remotely within seconds.