My point is that even if you magically add a hundred million EVs, the grid stands a decent chance of surviving, and simple actions between the owners and electric companies could assure it would.
It’s not a great situation, but it isn’t the guaranteed disaster you painted it as before going on to point out the more likely reality.
But in the real world, if a hundred million people who've never thought of EVs and the issues around them suddenly, overnight, had an EV, they would not know to charge at off-peak times. They'd plug in any old time. My home uses 15 to 20 kWh per day. Very little of that is for the car because I don't drive a lot of miles. But if the average is 15,000 miles a year, that's 41 miles a day. Call it 40 for easier math. At 4 miles per kWh that's 10 kWh per day, or a 50% increase in electric usage. But my house is big. Let's say maybe a 25% increase per EV household. Charging off-peak, no problem. Real life people are not going to do that. The people who buy EVs today are conscious of the environment. Magically giving everybody an EV puts them in the hands of people who will plug them in at any old time.
But this is a scenario that's not going to happen.
The reality is that the EV fleet and the grid are going to grow together, as is installed solar capacity. So it's not an issue.