I fail to see how we're "very close to a large percentage" being able to do this. Sounds plausible on the surface. But I still see a huge amount of infrastructure that needs to be put in place. It's not like it's good enough to just have a power outlet somewhere in the building that you can use. Number one, a parking garage would basically need a receptacle at every parking space. Along with a system for charging the person recharging their vehicle. Energy is not free.
That being said, are these difficult obstacles to overcome? No. But it's still a lot of infrastructure somebody needs to invest in before it becomes a plausible solution.