It's the usual sort of bootstrapping hurdle that a lot of the "user interface" of it probably can't be well developed until there's a general demand for it, and there won't be a general demand for it from the Utility side until there's maybe a larger installed base of vehicles with the capability.
But, the interesting part is still pointing out that plenty of people are already thinking about it, and it is a somewhat exciting part of the equation of how more electric vehicles potentially better balance the electric grid more so than "destabilize" it or hugely increase peak demand. (Because not only are they capable of smartly arranging their charge times to off-peak demand times, but also are giant roving batteries that can themselves act as temporary storage buffers for the grid.)
You generally don't need a full charged car at all times of the day: if you and your car both know you'll be at work for the next 8 hours and most likely you only need the 20 miles to get home, and a couple after work errands (plus some range floor for emergencies), there's plenty of leeway in how and when it charges.