Make all the changes to the grid you want but but someone must be on the other end using it or you have a overload...
Overloads can be handled in short order. Units can be powered up and down, I am sure that windmills either can have their blades feathered to not generate as much load or at some point in time that can be designed.
No matter the barriers they can be handled and still save fossil fuel.
Which in the long run is a benefit to all of us.