Yup, and this is why after 20 years of riding nothing but shimano I refuse to buy anything of theirs again.
I have an entire new Sram Red group sitting here waiting to go on a new frame. (Also ordering Look keo blades to replace my worn D-A 7800 pedals.)
I honestly wish everyone would just boycott the new 9000. Maybe our collective voices would motivate them to either go back to 10sp or make 11sp compatible on old hubs.
I understand and accept progress, but adding an (unnecessary imo) 11th cog is not progress when you have to replace/rebuild every wheelset you use.
It's a good thing you weren't a Campy user when they went to 8sp (I believe it was at that point) and created a new cassette spline to suit that made obsolete and incompatible ALL Campy cassette hubs prior to that!
If you don't like the thought of having to buy new 11sp compatible hubs, stick with 10sp. There will be plenty of 10sp hubs floating around for a few years to come I would expect.