As has been pointed out in this discussion: There really are two issues - 1) Can the grid support it, and 2) Will the electricity generation feeding the grid be able to keep pace.
I suspect the answer is already that this is not on issue for many places. In my personal situation, my daily charging electricity needs are about 25% of what my daily house electrical usage is. The vast majority of my house electrical requirement is during the day. the car charges at night.
The unused generation and grid/distribution systems available at night is more than adequate for my charging needs by a factor of 2-3 times. Although the individual ratios will differ, I'd expect the vast majority of EV owners fall in to the same category.
That's with changing nothing today. As electricity is diverted from refiner consumption, more solar comes online, etc... the generation side might improve.
The night charging is a good and important point -- the grid and current generation capacity can handle EVs.
Additional solar installations do not help the night-time EV charging, but they can replace daytime coal/natural-gas generation that targets the peak usage currently. On the other hand, wind generation tends to be stronger at night, which is often a waste now due to low demand at night -- which is already handled by the baseline nuclear & hydro generation here in Ontario.
So major EV adoption can be handled and wind-power generation is a good match for the nightly charging.