I just read Thom Hogan's post:
Whither Nikon? | byThom | Thom Hogan
And IMHO it makes for interesting reading... especially points like this:
At this point I'll be surprised if the D5 in August 2015 has a mirror. I'll take a wild stab at this right now even though we're still two years out: 24mp, mirrorless, augmented PD on sensor, 3m+ dot EVF, 30 fps silent electronic shutter, 12 fps+ mechanical shutter. Anything less than that will seem like a let down.
In view of these facts:
Who's still buying cameras, and why?
How do we feel about the current situation.
Oh, and this post isn't restricted to Nikon - it deals with pretty much everybody else especially MFD.