But lots of people _do_ already ride buses! There are already current riders, and potential riders who are making these marginal decisions. Occasional riders will decide between transport modes based on the trip - making marginal improvements (or regressions) would change the rate at which they choose to ride the bus.
Even if every current person's mind has been completely made up based on past experience, there are always "new adults" learning to get around and forming opinions.
So I strongly disagree: marginal improvements DO matter. And I agree with the author that this would be a relatively easy improvement to deliver for many cities.
I live in Chicago with the third-closest stop spacing per the article. I'm personally able to walk a block or two further to a bus stop no problem. Bus stop consolidation would save me a lot of time over the course of a year!