Sounds like an interesting concept, I really have to admit I occassionally give a good look to other OSes' user interfaces too, sometimes even like them more. This seems to be an effort to help adjust that.
I personally don't mind seeing things improve, the UI is the part you see the most in Android so I could go with some cleaning-up anytime. I think we all remember how big of a change 4.4 was when it came out.
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Currently using: XXLMI (XEU) / ClockWorkMod 18.104.22.168 / CyanogenMod 11 (2014/08/01) / K^Kernel 1.5 with Stock Voltages (3.4.101+416MB)