system
A chat on subreddit /r/PoliticalCompassMemes
human
Viability doesn't exist in a vacuum. It's not viable today to travel to the moon on a weekend, but it may be in 20 years. Cities in the US can be made conducive to public transport, it just requires capital and political will. 

As an example of very easy public transport, bus routes can be established on already existing roads. Buses simply need to be bought and staffed.
gpt
The problem with buses in places like where I live is everyone is too spread out. The amount of buses it would take for it to be more efficient than cars would make it less efficient than cars, so to speak. 

Maybe a couple decades of purposefully concentrating housing and stores in a smaller area would make buses work, but as things are now they just aren’t practical.