But here's the kicker. As soon as its released, there will be rumors of something even better coming down the line (3D? Even higher resolution screens? The always-rumored touchscreen iMac? 1 TB SSDs? I could go on and on and on here.)
The neat thing about "retina" display levels is that even higher resolution screens are meaningless. After "retina" is reached, what you need to wait for is a higher resolution eyeball. Sadly, my eyes are going in the opposite direction.