How can any wedding photographer get the shots with the 800?

Of course!  And at the same time, please solve world peace, world hunger, and give me the winning numbers to next week's lottery while you are at it. 

Seriously though, for me the real issue is Nikon should  never have dropped the D700 to begin with.  If Nikon felt it was "out of date", then a couple of  tweaks like upgrading the sensor and renaming it the D750 or the D700x or whatever, would of solved the issues.

IMO, this is not about making an obscure product, it's about dropping a well established product that had very few if any real problems and issues, and offering no real direct replacement.