The penetration of RIAs into the consumer world is beyond doubt. We have numbers supporting that time and again. To that extent, RIAs are here to stay. However, I sometimes wonder the scenario when it comes to enterprise apps.
Let us exclude AJAX for the sake of discussion because most GUIs these days are being built as web services for several good reasons and they often use AJAX for the ease and the instantaneous updates that became popular through Gmail.
It is very possible that Adobe uses Flex and AIR, Microsoft uses Silverlight, Oracle/Sun uses JavaFX internally. What about elsewhere?
It is well-known that Salesforce has a Force.com toolkit for Adobe Flex and AIR and that Oracle started using Adobe AIR for some CRM widgets, and I recently read that Samsung and China Mobile are using Silverlight but that article was actually about the low adoption-rates of RIA technologies at the enterprise level.
I also know that Symantec is using Flex on a HA/DR product (though the usage of AJAX is far more significant) and that the usage is slowly spreading to others products and services.
It is understandable for enterprises to be less proactive because of their inertia and because changing from one technology to another can be a slow and expensive process. Also, performance and scalability are major issues that enterprises keep in mind while taking such decisions.
What I would like to get an idea of, is the stand of enterprises when it comes to deploying RIA-based products on a large scale. If you are aware of RIA usage in any enterprise-level products, please let me know through a comment below.