The news would be big if Apple was trying to create a cross platform language and tool set, like what Microsoft is doing. But they are not. While someone might adopt Swift for their own platform development (like Linux) you are not going to get Google or Microsoft using Swift, well maybe Google, but I am still sure at some level Apple would forbid that from happening.
If Apple wanted wider adoption then they should have made Swift for Visual Studio on Windows. There is like 1000 to 1 more people developing on Visual Studio, including ALL the enterprise and professional development that is on that platform. But then Microsoft has already taken care of that with Visual Studio 2015 and Xamarin support to build native iOS apps right in Visual Studio.
In fact Microsoft will do more for Apple then Apple is doing for themselves by opening up Swift. Having millions of developers with access to native iOS development on Visual Studio 2015, including a new Visual Studio client for OS X, is already way more exposure then Swift has gained to date. I can easily see far more professional and enterprise apps being developed on Visual Studio, targeting all platforms, then Swift still being used largely to cater to proprietary development for iOS and OS X.
But, even among my friends that develop on OS X, iOS, they don't use Swift themselves, say its nice but years away from being great.
The big news was Microsoft offering native iOS developent on Windows with Visual Studio 2015. This will do more to open up iOS development to a wider core of developers then Swift will ever be capable of.