The idea of a Retina display on a Macintosh sounds fantastic. The words I’m typing at this moment are onto my iPad with its high resolution screen, and the text looks stellar. Retina displays rock. Sure, there are downsides and ugly bits that a Retina display Mac would bring with it — such as non-retina applications and websites — and Marco Arment does a good job of articulating those.
I have the good fortune of using applications on my Mac that are developed by bleeding edge developers. In addition to the native OS X apps I use (Mail and Safari), the 3rd-party apps like OmniFocus, Yojimbo, Coda, Transmit, MarsEdit, Byword, iA Writer, and others which are all run by developers which I have no doubt will be quick to update their Mac applications to support Apple’s new high resolution displays.
I need to link to Shawn more often. He’s a great tech writer and pretty level headed, as exemplified in this article. Yet I am more worried about websites with Retina displays than Shawn is; it’s a big development on the web development side and it’s going to take a while for the community to adapt.