The technical issues sited are just that, technical problems that can and will be solved. Yes the cost will be high, about the same as the investment in the current infrastructure. Let’s do a thought experiment. Assume all vehicles are EV. Assume that 90% of the time they are parked, like today’s cars. Assume they all have electric circuits that supply clean power to the grid (right voltage and frequency and phase). That resource is possible and resolves a large part of the load fluctuating or supply fluctuations. Charging of EV is 90% of the based on optimal grid load.
Another thought experiment. Assume battery life of 50 years using flow batteries that are 10% of today’s storage cost. Homes are required to spend 5% of the home cost in electric storage.
These thought experiments are based on the eco system trends ( research, design and production progress in play today).
Will the electric grid be different. Sure will it work? Of course it is a technical issue that is a work in process. Likely the same result as semiconductors cost and performance 2X every 18 months.