You don't necessarily need 50A everywhere. Level 1 charging only needs about 12A. It's slow, but if you can be plugged in most of the time, it doesn't particularly matter that it's slow. That's probably enough to keep you topped off when you're just doing light commuting. A lot of level 1, a healthy amount of of level 2 and a smattering of level 3 would probably cover people's charging needs.

It’s still a pretty big upgrade. Parking meters take basically trivial power to run right now. The ones near me are solar! They might not even be connected to the grid at all!