Better to post photos your taking with you're phone/camera. Why are we talking about an iphone on a camera site.
The Retina Display will be useful for the mobile professional who edits on the go; however, If you are concerned about upgradeability, you can always get a Mac Pro or a Macbook Pro non Retina and buy a display that suits your needs. The premium is quite high right now, but if you "need" and you have the money for it then you are a creative professional that can afford it. It is a luxury item in one sense. I really do not see this as an absurd price for the creative pros who are willing to purchase Full frame DSLRs with corresponding glass.
My fear is that of a few others on this blog. The hard drive and the ram are not as easily replaceable as in the former models. Although the other models are still available the price difference almost pushes you to the Macbook Pro Retina Display.