Earlier quoted context omitted.
In Atlanta we had one of our main highways collapse, I85. It was the exit after my place. Everyone adjusted and it actually forced people to ride the train. The train stations had to borrow parking spaces from businesses and schools. Everyone will adjust. On the first day it will be a disaster if it’s unexpected.
For years I commuted by train/bus to school/work until I could afford (the extra $200ish per month) to switch to driving to claw-back an hour of time I spent commuting each day. If traffic devolved to the point that I wouldn't be able to drive to work anymore I /would/ adjust, but I'd be generally less happy for it.
Now that I live in Munich, doing folding scooter + train is faster than driving to work. Mostly because public transportation here is good, rather than bad, because they've chosen to invest seriously in multiple modes of transport, rather than just one.