You need a garage, and a circuit with 60A capacity. Most houses built today have 200A total capacity, older homes are 100A. At some point the electric grid will need updated.
You are correct that the grid will need updating - all those houses using 15 amps more add up.
17kWh battery.
47 miles EV range.
Charge time @ 120V = 12 hours. It essentially can charge up to 4 miles of range per hour on a standard circuit in a US home. Cold weather? Your power needs go up, range goes down, and charge rate drops as well. 15 amps @ 120V EV charging is not practical for most EV owners, at this time, but you are correct that it is possible.
But more importantly, they can backup to gas so if you can only do 80% of your trip electric there is no real problem, you still are getting great fuel economy.
For the people for whom an electric car makes sense, the overwhelming majority could make due with a level 1 charger (12 amps 110 volts).
L1 charger provides 4-5 miles of charge per hour, so 8 hours in the garage at night would more than make up for the commute. If you have a larger range (200+ miles) you can make it up on the weekends.
If you have a 100+ mile commute each day, sure get a L2 charger. Or better yet, buy a hybrid.