iPad isn't a threat to the Open Web. it creates new vector for content creators for free. What iPad and its ecosystem does however is to create a threat against Search Engine Optimization, a threat to Google.
iPad and its ecosystem doesn’t offer a threat to the Open Web, it creates new ways for Content Creators like bloggers, and podcasters who can choose to offer their content for free. What iPad and its ecosystem does however is to create a threat against Search Engine Optimization, ergo: a threat to Google. Simply put, iPad content is a clear and present danger to Google indexing all the web’s and by extension, all of humanity’s content.