My response to arguments against EV's due to grid constraints is the arguments assume a dumb charging system. The system would work just fine with EV's communicating real time with the grid. They can charge when pricing is favorable to buy and discharge when pricing is favorable to sell. And when you have a big trip coming up, they'll know not to discharge anything so you have a full charge.
But I agree, battery technology has a way to go before everyone gets on board.
Here's today's Texas wind and solar generation. Peak wind at night and peak solar during the day. It's not a flat line but it's not terrible either. Texas' wind generation is pretty mature but solar is still on a steep climb so there will be much more solar capacity during the day in the next few years.
