I don't get all the frizzle-frazzel.
Professionals shooting high action images for a living, (and all those mimicking them), have their camera. If there wasn't a demand and a need, they wouldn't make the things any more. When some smaller camera delivers the same performance for 1/2 the price, they will go bye-bye.
Pros like Guy, and his versatile applications, need more image than these cameras deliver. No pro wants to pay $6,500 for a camera they use occasionally at least, not anymore. The economy saw to that.
@ Mat: the A7/A7r isn't limited to adapting legacy glass or other brands to the Sonys. The A7/A7R is a Sony product and all the Sony A mounts work on them with the SLT dual AF adapter so the lens selection is not small, nor particularly limiting.
Those that think the Pro tanks are suitable wedding and event cameras haven't been paying attention. NO ONE (except a few die-hards) wants to drag around a bag of bricks for 7 to 10 hours anymore regardless of "balance". The 5D pounded the first nail in that coffin.
When the next gen EVF and an AF system like the A6000 are put into the next wave FFs then the game will be afoot.
Meanwhile, camera's like the D4 reign supreme for what they were intended.