Worrying about the electrical infrastructure to support EVs is fear mongering. Sure, it'll need to shift and change, as with any infrastructure. It's already done a ton of changing for solar and renewable sources. And will need new and additional generation beyond that. But it also has pretty huge excess delivery capacity as is.
Electrical infrastructure is sized for peak loads. There's ample margin and bandwidth outside of peak, when electrical demands fall. Like nighttime. There will be new paradigms to supporting peak loads with distributed sources such as some of the battery stations Tesla has installed in regions. That can be taken further where EVs wouldn't just charge, but can be part of the support peak loads.
If cars can run on fuel, gas, hydrogen, whatever, than there can be power plants that do this at industrial scale to create electricity in even more efficient fashion.