When we speak of free software, we are referring to freedom, not price.
Most free software is GPL'd.
So if GPL3 was adopted by the Free Software Foundation, it's likely that within a short time, most free software would become licensed under GPL3. Free software is becoming more and more economically useful. Packages like Linux and Apache are gaining market share, crowding out proprietary alternatives. Major computer manufacturers, like IBM, HP, Dell, Compaq, are moving onto the open-source bandwaggon. As free software becomes more important, companies that wish to prevent others from using it may be deterred from doing so if it meant that they couldn't use a large subset of free software themselves.