Thats not the question being asked, the question being asked is if the retnia screen is worth the extra price and the inability to upgrade, and the answer for myself and others is No. I'll keep my upgradeability thx.
Eventually (i.e within 4 years), we will all have Retina displays. 4 years ago, people were asking the same exact questions about the MacBook Air (e.g. why get a notebook that has no optical drive or Ethernet port?), and now "Ultrabooks" are all the rage. If I had the money, I'd get the rMPB as a main computer in a heartbeat. I'm an Air fan, though (and have been since Day 1), and will wait for the technology to trickle down to my level. I won't deny that "Retina" is the future, though.