<<Outdoors? Who knows? An 8fps D800 would do me nicely I suspect. Any rumors of that?>>
We can always be sure that rumours will continue! However, I take birds in flight and the D800 in DX mode will give 6fps. I was resitive to the D800 until recently for all the reasons you mention and longed for a D400 and to a degree still do to replace my D7000. Time marches on and I bought the D800 now I have no regrets, perhaps a new semi pro will appear in January (a common time for announcements) but maybe not. I have learned to shoot with what I have in my tool kit. My birding with the D800 is work in progress, but I have no doubt it will provide me with satisfactory shots eventually, it's a steep learning curve.
I think the only thing that is a fair guess, is that we are approaching the end of SLR cameras as the future's mirrorless.