One aspect of this that I think you may have overlooked is the number of Lightroom (and Photoshop) users who also employ plugins such as those from Nik, onOne and Topaz. I use Lightroom 99.9% of the time, but I also use some of the plugins such as Viveza, Color Efex Pro and Silver Efex Pro for additional processing. onOne has just issued the latest version of their Perfect Photo Suite that brings to Lightroom the ability to use layers to process images and then return to Lightroom without the necessity of employing Photoshop for layering. Their set of applications also comes in a stand-alone mode. There are a few areas where they do not have capabilities similar to those in PS, such as putting text onto images, but I am sure that this will come. If I was Adobe, and I am not, I would be paying very close attention to the onOne software and they probably are.