Very true, and it's a well understood problem. For a variety of reasons it is better to charge during the day than overnight (not the least being that solar works better during the day, helping to mooting nightly storage concerns), and so an ideal situation here is that many or even most of those charged during the day at work.
There's a lot of possibilities here though. With smart meters and cars hooked up all night, the power company has a lot of freedom to not just 100% every car instantly, but throttle and prioritize as necessary.
> For a variety of reasons it is better to charge during the day than overnight
This was one of the examples given in the article - the answer on whether it's better to charge at night or during the day varies by who you ask.
Solar does work better when the sun is out, but what if your area isn't using solar power? Air conditioner use peaks when the sun is out, what is your area uses much of its electrical capacity during daylight hours on HVAC?
There's a lot of possibilities here though. With smart meters and cars hooked up all night, the power company has a lot of freedom to not just 100% every car instantly, but throttle and prioritize as necessary.