What if Microsoft (or another company hostile to free software and GPL) buys the FSF or otherwise takes control of the FSF? It would release version 4 of the GPL which would be a proprietary license. What would happen to all the existing software that are licensed under "GPLv2 or (at your option) any later version" and "GPLv3 or (at your option) any later version"? What would happen to all the code that the FSF owns in the GNU Project?
I fear that this might result in the ultimate victory for Microsoft, after having worked hard for decades to destroy free software. These hostile companies seem to have infiltrated open source. For example, Microsoft joining the Linux Foundation to control it and to destroy it from the inside, all while pretending to "love" open source as part of its corporate propaganda.