What happens when desktop App Stores (e.g. Mac App Store) start taking hold as the primary delivery platform for the desktop? Will they erode some of the benef

What happens when desktop App Stores (e.g. Mac App Store) start taking hold as the primary delivery platform for the desktop? Will they erode some of the benefits of web apps on the desktop? When development and deployment are easier, the end user will benefit from more frequent updates, fixes and new features.