To be honest, I don't think the price is too high when you consider the price impacts associated with 4K technology.
For instance, Sony's 84" 4K television is $24,000. By comparison, a 2K 80" TV would run you roughly $4000.
The fact of the matter is that 4K is not just an evolution, it is a revolution, in the same way HDTV replaced SDTV. I would, however, hold off on this purchase considering that in another few years, these cameras will come down to affordable prices - as will 4K televisions. Of course, by that point, the next "big" thing will be 8K!