This article seems to assume that in order for resolution to have an effect on perceived picture quality, you need to be able to discern individual pixels in the image and I haven't been convinced this is the case. Couldn't the image just "look sharper" without the viewer being able to pinpoint the extra pixels? Anecdotally, I can instantly tell the difference between broadcast 720p and a 1080p Bluray on my 50" from 13 feet away, but that might also be due to compression/encoding/etc.

Also, I'm not convinced that in the future we won't commonly have 60"+ screens in our homes. If you could afford it, why not have a true home theater? The bigger issue with 4K for the moment is getting actual 4K content.