disclaimer: i don't exactly have a dog in the fight, i'm a mac/unix guy. but i do (to the extent that i do) follow the moves Nadella makes and i like it.
this is the right move. it is insanity in this day and age to have to support multiple substantially different versions of an operating system for general population. its unjustifiably expensive and unsustainable.
bottom line, if you feel like whining, i have a piece of advice for you, get over it. either move to unix or upgrade to win10. those are your two choices.