It's the document model! There is nothing wrong with RiA. Adobe is doing great stuff, and they fully support the WebKit flow document model in their RiA. Silverlight on the other hand is a true threat to the Open Web because it implements uniquely proprietary format, protocol and interface alternatives.
The problem with AJAX is that it's difficult to scale. Advancing JavaScript libraries, structured WebKit, BrowserPlus and Google's GWT-Google Gears promise to tame that problem. At the end of the day though, i see AJAX as an important aspect of the browser as an RiA runtime engine.
Here's what concerns me; 500 million MSOffice desktops that anchor most of the world's client/server business processes speak XAML "fixed/flow". These desktops are the information pumps for billions of business critical documents. And they do not speak the language of the Open Web. They speak the language of the Microsoft Web-Stack and Mesh services.
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