Aviators don't wear winter blues, at least those that are self respecting. I never even bought it. And I have not seen that uniform worn by anyone in 6 or 7 years.
If we get Service Dress Khakis, I bet they do away with Summer Whites and Winter Blues. Much like the new enlisted uniforms are superseding witner blues and summer whites for E's. So in reality, we will probably have one less uniform to carry around, 'officially'.
And just as I thought, the Service Dress Khakis are only being wear tested right now. The 'test' runs until the end of August. I imagine we might see a uniform message come out about a year or so from now with any changes.
http://www.navytimes.com/news/2008/04/navy_khakiweartest_043008w/