Windows 9 - where did you get that from? W9 is at LEAST two years away (assuming MS follow the same process of the Beta Release Candidate program - which is two candidate releases over approx 6-8 moths each) then a final beta candidate, and then the final release product..Usually takes about two years all up..and they have not even announced a prelim beta for W9 yet......it will come (and it will be very similar to W8.1) but it is a long way down the road. W8 still has many updates yet. And with W phone 8 (also possibly being upgraded to match 8.1) the differences are becoming less discernible. RT is dead.
Oh and the "big customers" also were screaming and kicking when XP went to Vista, and then to W7 - but they still upgraded over time and grudgingly acknowledged it was a better system (although
NOT Vista which was a dog) . Big business always complains, about everything, really!