Couldn't it work in reverse?  There must be people who learned Cocoa/Objective-C only to get on the iPhone bandwagon, and are therefore closer to Mac software development than they would ever have been without the iPhone.<p>The article doesn't seem to think that a Mac app store would work, but I know I'd like one (speaking both as a maker and user of Mac software).  I know I'd buy more, too; it would be easier to know what's actually available, and I'd discover apps for unexpected things.