While I agree with you on the traditional on-premise data centers shrinking to make room for cloud usage, your notion of EC2's superior portability compared to Windows Azure is not entirely accurate for real applications. Every real application has highly portable core that is surrounded by runtime dependent outterlayer(s); the core will always be portable while the shell that depends on the runtime services like S3 requires refactoring to accommodate the latencies resulting from the migration of the application to another cloud provider.
Ruby code running inside Windows Azure that doesn't depend on any Azure services is as portable as the same code running inside EC2 with no dependencies on Amazon services. Real applications don't run in silos; they do consume other services for delivering end user functionality. During this process of consumig management and monitoring, psersistence, integration and other run time services,the system takes design time as well as run time dependencies. Same is true for .NET, Java, PHP, Python or other code.
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