Charging enroute won't necessarily cause an issue as the Rapid charge Network can easily use Super Capacitors to spread the load as well as allow for the 150/200+kW charging rates that are coming.
One of my bug bears this attitude..... Why do people automatically assume that the ev is going to be the death knell of the Grid?
https://cleantechnica.com/2019/02/23/uk-electric-nation-ev-smart-charger-trial/
Raindance as in you have to dance around catching the drips. Hard-On just because you are used to poverty spec living doesn't mean that the rest of us want to be.