[sbierwagen]

You can't install more than a handful of chargers without needing to run new circuits back to the main panel. Installing a hundred (not unreasonable for future needs!) would probably double the power consumption of the entire building, and require upgrading the utility connection, maybe even running new lines to the closest substation.

[mcculley]

Not to mention that with such an increase in overall electricity consumption in the garage, one might want to charge the residents for use of it. Doing so might require changes to architecture (e.g., putting electric cars on a different floor or section). There are lots of things to consider and real estate investors/developers are not thinking of any of them.