There is an important difference between a new feature on a social network and a whole new OS. Many people have software and/or drivers installed that won't work on a newer OS.
I agree! I just think Microsoft either has not taken into account the possible backlash from breaking people's printers, scanners, webcams, programs, etc. or maybe they have taken it into account and decided the backlash was worth the increased Win10 marketshare.
Backlash? It will take years for sales to be affected (the general population cannot switch to Mac/Linux in less time) and the courts won't lift a finger.