So would you pay $6,200 for a firmware update and a headphone jack? Well I can bet you that someone right now is hacking and making their own firmware to sell for a much more affordable price. And there is already a boatload of options and work arounds for not having a headphone jack built in.
Like I said, Nikon is not exactly innocent here either. The D600, D800 and D800E, and the top of the line D4, is basically the same camera manufactured in the same place at the same time, with different firmware, and a few little hardware changes.
But this is by far the biggest hamstringing we have ever seen.