Certainly not through conventional advertising. There's heaps of billboards where I live, and I'd have a very hard time finding one for a shop/service/political party/business that hasn't been around for years.

The small city of São Paulo (~22M people) has also banned billboards since 2007, and life goes on.

Meanwhile Maine banned them decades ago and it turns out the world doesn't end and you can still find ambulance chasing lawyers and weird cults just fine.

Hell, one of our best known lawyers in the entire state is a freaking injury liability one.

But hey, direct evidence of lack of harm never seems to stop all the cockroaches coming out of the woodwork insisting that the world fails if we can't have our eyeballs sold to the highest bidder at every second, and that a different world is just impossible. Gee, I wonder if those people are just ignorant, or maybe have some motivated reasoning, like if most of them were paid entirely by advertising revenue.