First, I guess I should preface this question with the following information: I'm not on board with the Retina MBP. I don't like that there is no DVD drive (which can now, thankfully, be upgraded to a blu-ray drive via third-party hardware), no ability to upgrade the RAM, no regular (i.e., non-flash) HD, and no ethernet port. As far as I'm concerned, these are all essentials that are thankfully still a part of the non-retina MBP line.   So my question is: how long do...