Where do the figures for non-desktop use in the Enterprise come from? I just do not believe them. If it is from questionnaires then the person being questioned is not providing accurate information but providing massaged figures for whatever reason. I do not know one single person who uses anything other than a desktop for mass email management or long chunks of working. If you use a Smartphone or tablet/slate/pad for working then you run the risk of health and safety issues and efficiency issues. The desktop is not dead and this is a complete red herring spun into fact, when it is not, by ill informed media and wanna-be hobbyist bloggers.
I welcome the Surface as it looks like it has a potential to touch type. As a company director I look for efficiency, accuracy and common sense target hitting and using a slate/pad or tablet, whatever brand. Maybe Surface will address this.