That's a good approach, and I definitely see the value in it (and recommend it in some cases), but then you have the questions of how to get the apps onto those virtualised machines? Yes, you can use some form of ESD, or even manual installations, but then what about when you have apps which 'conflict', or require constant updates? And what about users who require off-line access to their apps, etc?

The point I was trying to make was that the article completely ignored the areas of app "virtualisation", not necessarily that it's the right approach for everyone..