Good thread - I was gonna start one up on the UWA-FX linkage myself as I am unsure of the direct benefit. (Also BTW I did start up a separate topic on DR and IQ as I wish to know more there.)
Anyhow for this thread, re. WA and FX I don't really get it unless people are actually saying: - I already have a drawer full of WA lenses and now they will work as intended, but if I didn't have a drawerful already then no FX advantage here. - there are better quality lenses (14-24 and 24-70 specifically) right at this moment for FX. But again there is nothing technical preventing Nikon from coming out with a DX nano-coated 16-60 VR f2.8 is there? (insert other desired DX WA range here _____ or DX WA prime here _______).
Is the linkage of FX and WA really more about the current crop of available WA lenses?
SteveK My Nikonians gallery 'A camera is an instrument that teaches people how to see without a camera.' -- Dorothea Lange