Since the 5k iMacs went in my local stores, I always fiddle with them and be amazed at the oh-so-sharp and huge real estate to play with. I just replaced my ruined mba to a 13" rmbp and the difference is so worth it, but still, as you said, i need to use the scaling feature. I think there is a way to use the retina display on it's native res, but the text will be so unbearably small.

Yeah. The cost is still prohibitively expensive to have a desktop-sized display. I mean, FHD took years to be the standard (although i prefer 16:10). We'll have 8k computer displays released before 5k becomes the standard.