If this happens im dropping out of D2 forever, not even joking. There is not a single company that wouldn't give players at least 3 months before they make that kind of a change. I remember dota giving players almost full year to go from xp to 7 and bunch of other steam games too. You see nvidia made announcement about not supporting win7 anymore and they did it early in the year and gave everyone 10 months to adjust.