There are a lot of apps that will be replaced -- or at least have some very heavy competition -- from the new features in iOS 5. It's easy to look around the App Store and see developers that have been 'Sherlocked' by Apple's inclusion of their functionality in the core OS; Twitter clients in particular are going to have a hard road ahead, and no-frills reminder apps are pretty much done for.
That's not the same thing as the wholesal
