Most of America is rural. Having an open space for your mode of travel has been de rigeur since the days people rode horses around. Most poor people, really poor people, can barely afford a car and the mandatory insurance now. Jacking up gas and parking taxes has terrible consequences to theses folks. No matter how precious the goal you are trying to accomplish.
Look, I'd love a world without gasoline-powered cars, but when it's an hour to town, I'm going to be going in something. And that something is going to need to park somewhere.
I increasingly see a vast difference between urbanites and suburbanites/rural America. It's a shame they seem at cross-purposes so much. The United States is simply nowhere near as dense as Europe is, where things like this might make more sense.
EDIT: Just to be clear that I am directly addressing the author's point: The fact that the cost of land (and to society) for free parking has risen over the last few decades is not germane. Everything has risen in cost. Providing parking for others has always been a cost of having a residence or doing business in the city. I see nothing new in this article except a new look at those costs. The reason for them hasn't changed at all. Nor their justification.