OK, but everyone isn't adopting an EV right away.
And as has been mentioned, EVs are generally used overnight. So they utilize energy that would have been created anyway to maintain a Baseload.
One cool thing about EVs going forward is that future generations can actually used as additional Storage for the Grid.
People talk about what to do when the power goes out, well a fully charged EV can actually power the basic functions of a home for a good deal of time. All without having to buy a Generator.