Interesting and subtle change. However it will likely be net negative. Most high volume copiers/printers are laser and/or covered by a cost per copy maintenance agreement. Meaning that most organizations pay the same price for a page regardless of how much toner is used on that page.
Contrast this with the cost of enforcing a single font family across millions of systems and documents. There are a large number of unseen costs here. Imagine 10 years from now some vendor responding to an RFP for healthcare.gov v2.0. The government insisting that the source code be converted to garamond for the weekly status reports. The HN posts that day will be about how ridiculous of a requirement this is.